Mechanical synchronization and locking spiral driving device

Abstract

The invention relates to driving equipment, in particular to a mechanical synchronizing and locking spiral driving device which comprises a first spiral propelling cylinder, a second spiral propelling cylinder and a synchronizing shaft assembly. The synchronizing shaft assembly is connected between the first spiral propelling cylinder and the second spiral propelling cylinder, so that piston rods of the first spiral propelling cylinder and the second spiral propelling cylinder synchronously stretch and retract, and the first spiral propelling cylinder comprises a cylinder body, a piston rod, a screw rod, a nut and a screw rod driving assembly; the nut is in threaded connection with the screw rod, the piston rod is fixedly connected with the nut, and the screw rod driving assembly drives the screw rod to rotate, so that the nut drives the piston rod to stretch out or retract. The first screw propulsion cylinder and the second screw propulsion cylinder act synchronously, the structure is simple, and the position of a driven load can be locked without other equipment.

Description

Technical Field

[0001] This invention relates to a drive device, and more particularly to a helical drive device with mechanical synchronization and locking. Background Technology

[0002] In applications involving the deployment, retraction, erection, leveling, and lifting and lowering of large, heavy loads, dual hydraulic cylinders or dual electric cylinders are typically used for synchronous drive to minimize load structural deformation. This requires specialized hydraulic control valves and electrical control systems for synchronized control. Once the load has reached its designated position, mechanical pins are generally used to reliably lock the load in place for extended periods to ensure personnel and equipment safety. When mechanical pins cannot be installed, using ordinary hydraulic cylinders and hydraulically controlled check valves places high demands on the sealing design of the cylinders and piping. Existing drive systems cannot simultaneously achieve load position locking without mechanical pins while maintaining a simple structure. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a mechanically synchronized and locking screw drive device that can lock the position of the driven load without the need for other equipment during the motion process of two cylinders synchronizing.

[0004] To address the aforementioned technical problems, this application provides the following technical solution: This invention discloses a mechanically synchronized and locked helical drive device, comprising a first helical propulsion cylinder, a second helical propulsion cylinder, and a synchronous shaft assembly. The first helical propulsion cylinder includes a cylinder body, a piston rod, a screw, a nut, and a screw drive assembly. The piston rod is disposed within the cylinder body and is a hollow component. A portion of the screw extends into the piston rod. The nut is threadedly connected to the screw, and the piston rod and the nut are fixedly connected. The screw drive assembly is connected to the end of the screw located outside the piston rod. The screw drive assembly drives the screw to rotate, causing the nut to extend or retract the piston rod. The second helical propulsion cylinder has the same structure as the first helical propulsion cylinder, and the screw of the second helical propulsion cylinder has the same thread direction as the screw of the first helical propulsion cylinder. The piston rods of both the first and second helical propulsion cylinders are hinged to a load. The synchronous shaft assembly connects the first and second helical propulsion cylinders, enabling the piston rods of the first and second helical propulsion cylinders to extend and retract synchronously.

[0005] Furthermore, the screw drive assembly includes a hydraulic motor, a gearbox drive gear, and a gearbox driven gear. The gearbox drive gear is connected to the output shaft of the hydraulic motor, the gearbox driven gear meshes with the gearbox drive gear, and the gearbox driven gear is connected to one end of the screw located outside the piston rod.

[0006] Furthermore, the screw is a trapezoidal screw, and the nut is a trapezoidal nut.

[0007] Furthermore, it also includes an extension-to-position proximity switch and a retraction-to-position proximity switch, both of which are connected to the cylinder body. The extension-to-position proximity switch is located near the end point of the nut's movement relative to the screw, and the retraction-to-position proximity switch is located near the starting point of the nut. When the piston rod extends to the position or retracts to the position, the extension-to-position proximity switch and the retraction-to-position proximity switch respectively send out extension-to-position information or retraction-to-position information of the piston rod.

[0008] Furthermore, one end of both the first spiral propulsion cylinder and the second spiral propulsion cylinder is hinged to the support.

[0009] Furthermore, the synchronous shaft assembly includes a first right-angle gearbox, a first coupling, a second right-angle gearbox, a second coupling, and a synchronous shaft body. The first right-angle gearbox contains a first bevel gear and a second bevel gear. The first bevel gear is driven by the gearbox drive gear. The second bevel gear meshes with the first bevel gear and is connected to the output shaft of the first right-angle gearbox. The second right-angle gearbox contains a third bevel gear and a fourth bevel gear. The third bevel gear is driven by the gearbox drive gear of the second helical propulsion cylinder. The fourth bevel gear meshes with the third bevel gear and is connected to the output shaft of the second right-angle gearbox. The output shaft of the first right-angle gearbox is connected to the synchronous shaft body via the first coupling, and the output shaft of the second right-angle gearbox is connected to the synchronous shaft body via the second coupling. The first bevel gear and the third bevel gear rotate in the same direction, while the second bevel gear and the fourth bevel gear rotate in opposite directions.

[0010] Furthermore, a brake is also installed on the synchronous shaft body.

[0011] Furthermore, it also includes a hydraulic control circuit, which comprises an oil source, a three-position four-way solenoid directional valve, a speed control valve, a main oil supply pipe, a main oil return pipe, a first working pipeline, a first working branch, a second working branch, a second working pipeline, a third working branch, and a fourth working branch. The oil source is connected to the P port and T port of the three-position four-way solenoid directional valve through the main oil supply pipe and the main oil return pipe, respectively. One end of the first working branch is connected to the working port A of the first hydraulic motor, and the other end is connected to the end of the first working pipeline. One end of the second working branch is connected to the second spiral... The hydraulic motor of the propulsion cylinder has its working port A connected to the end of the first working pipeline. The starting end of the first working pipeline is connected to port A of the three-position four-way solenoid directional valve. One end of the third working branch is connected to the working port B of the hydraulic motor, and the other end is connected to the end of the second working pipeline. One end of the fourth working branch is connected to the working port B of the hydraulic motor of the second spiral propulsion cylinder, and the other end is connected to the end of the second working pipeline. The starting end of the second working pipeline is connected to port B of the three-position four-way solenoid directional valve. The speed control valve is located on the main oil supply pipe.

[0012] Furthermore, it also includes a one-way throttle valve, which is disposed on the second working pipeline.

[0013] Furthermore, it also includes multiple manual shut-off valves. A first connecting pipe is provided between the first working branch and the third working branch, and a second connecting pipe is provided between the second working branch and the fourth working branch. One manual shut-off valve is provided on each of the first working branch, the second working branch, the third working branch, the fourth working branch, the first connecting pipe, and the second connecting pipe.

[0014] Compared with the prior art, the mechanically synchronized and locking screw drive device of the present invention has at least the following beneficial effects: This invention discloses a mechanically synchronized and locking helical drive device. By setting a synchronous shaft assembly, it ensures the mechanical synchronization of the hydraulic motors of the first and second helical propulsion cylinders, enabling the piston rods of the first and second helical propulsion cylinders to extend and retract synchronously. Simultaneously, since the piston rod is fixedly connected to a nut, with the nut threaded onto the screw, the nut drives the piston rod to extend or retract. Therefore, the mechanical self-locking of the screw and nut enables the piston rod to be locked in position. When this mechanically synchronized and locking helical drive device drives a large platform to rotate up and down, it also reliably maintains the position of the large platform. It can lock the position without the need for other equipment, ensuring the safety of personnel and equipment on the platform, and has a simple structure.

[0015] The mechanical synchronization and locking screw drive device of the present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the mechanical synchronization and locking screw drive device of the present invention used to drive the worktable in the unfolded state of the worktable. Figure 2 This is a schematic diagram of the unfolding and retraction process of the worktable when the screw drive device of the present invention, which is used to drive the worktable, is used. Figure 3 This is a schematic diagram of the screw drive assembly in the screw drive device for mechanical synchronization and locking of the present invention.

[0017] Figure 4 This is a schematic diagram of the synchronous shaft assembly in the helical drive device for mechanical synchronization and locking of the present invention. Figure 5 This is a schematic diagram of the control circuit of the hydraulic motor in the screw drive device for mechanical synchronization and locking of the present invention. Detailed Implementation

[0018] like Figure 1 , Figure 2As shown, the present invention discloses a helical drive device for mechanical synchronization and locking, comprising a first helical propulsion cylinder 01, a second helical propulsion cylinder 02, and a synchronous shaft assembly 05. The first helical propulsion cylinder 01 includes a cylinder body 11, a piston rod 12, a screw 13, a nut 14, and a screw drive assembly 03. The piston rod 12 is disposed inside the cylinder body 11 and is a hollow component. A portion of the screw 13 extends into the piston rod 12. The nut 14 is threadedly connected to the screw 13, and the piston rod 12 and the nut 14 are fixedly connected. The screw drive assembly 03 is connected to the end of the screw 13 located outside the piston rod 12, thereby driving the screw. Component 03 drives the screw 13 to rotate, causing the nut 14 to drive the piston rod 12 to extend or retract. The second spiral propulsion cylinder 02 has the same structure as the first spiral propulsion cylinder 01. The screw of the second spiral propulsion cylinder 02 has the same thread direction as the screw 13 of the first spiral propulsion cylinder 01. The piston rods of the first spiral propulsion cylinder 01 and the second spiral propulsion cylinder 02 are both used to hinge to the worktable 06 or other loads. The synchronous shaft assembly 05 is connected between the first spiral propulsion cylinder 01 and the second spiral propulsion cylinder 02, so that the piston rods of the first spiral propulsion cylinder 01 and the second spiral propulsion cylinder 02 move synchronously. This invention discloses a mechanically synchronized and locking helical drive device. By setting a synchronous shaft assembly 05, the hydraulic motors of the first helical propulsion cylinder 01 and the second helical propulsion cylinder 02 are mechanically synchronized, causing the piston rods of the first helical propulsion cylinder 01 and the second helical propulsion cylinder 02 to extend and retract synchronously. At the same time, since the piston rod 12 is fixedly connected to the nut 14, and the nut 14 is threadedly connected to the screw 13, the nut 14 drives the piston rod 12 to extend or retract, thus achieving position locking of the piston rod 12. When the mechanically synchronized and locking helical drive device of this invention drives the large platform to rotate up and down, it can also reliably maintain the position of the large platform. It can lock the position without other equipment, ensuring the safety of personnel and equipment on the platform, and has a simple structure.

[0019] Optionally, such as Figure 3As shown, the screw drive assembly 03 includes a hydraulic motor 31, a gearbox drive gear 32, and a gearbox driven gear 33. The gearbox drive gear 32 and driven gear 33 are housed within the gearbox housing 36. The gearbox drive gear 32 is connected to the output shaft of the hydraulic motor 31, and the gearbox driven gear 33 meshes with it. The gearbox driven gear 33 is connected to the end of the screw 13 located outside the piston rod 12. Specifically, the output shaft of the hydraulic motor 31 is keyed to the gearbox drive gear 32, and the gearbox driven gear 33 is keyed to the screw 13. The screw 13 and the nut 14 form a threaded transmission pair. The gearbox drive gear 32 is supported on the gearbox housing 36 and the gearbox cover 37 by deep groove ball bearings 34 and 35. When the output shaft of the hydraulic motor 31 rotates, it drives the gearbox drive gear 32 to rotate, and the rotation of the gearbox driven gear 33 drives the screw 13 to rotate, which in turn drives the piston rod 12 to extend or retract via the nut 14. The screw 13 is driven to rotate by the hydraulic motor 31, which facilitates the forward and reverse rotation of the screw, enabling the nut to drive the piston rod to extend or retract, and the structure is simple.

[0020] Optionally, the screw 13 is a trapezoidal screw and the nut 14 is a trapezoidal nut. Alternatively, the screw 13 can also be a sawtooth screw and the nut 14 can also be a sawtooth nut. By using a screw and nut with a trapezoidal or sawtooth thread that has self-locking capability, the helical drive device of the present invention can further ensure that the mechanical synchronization and locking can achieve the position locking of the piston rod 12 and the mechanical position locking of the load.

[0021] Optionally, it also includes an extension-to-position proximity switch 15 and a retraction-to-position proximity switch 16. Both extension-to-position proximity switches 15 and retraction-to-position proximity switches 16 are connected to the cylinder body 11. Extension-to-position proximity switch 15 is located near the end position of the nut 14 relative to the screw 13, and retraction-to-position proximity switch 16 is located near the starting position of the nut 14. When the piston rod 12 extends to the position or retracts to the position, extension-to-position proximity switch 15 and retraction-to-position proximity switch 16 respectively send extension-to-position information or retraction-to-position information of the piston rod 12.

[0022] Optionally, one end of both the first spiral propulsion cylinder 01 and the second spiral propulsion cylinder 02 is hinged to the support 04. When the mechanically synchronized and locking spiral drive device of the present invention is connected to the worktable 06, the piston rods of the first spiral propulsion cylinder 01 and the second spiral propulsion cylinder 02 are respectively connected to the worktable 06 through an upper lug, and the cylinder bodies of the first spiral propulsion cylinder 01 and the second spiral propulsion cylinder 02 are respectively connected to the support 04 through a lower lug. When the output shaft of the hydraulic motor 31 rotates clockwise, it drives the gearbox drive gear 32 to rotate to the right, and the gearbox driven gear 33 rotates to the left, driving the screw 13 to rotate to the left, causing the nut 14 to drive the piston rod 12 to extend; conversely, when the hydraulic motor 31 rotates counterclockwise, the piston rod 12 retracts. The rotational motion of the hydraulic motor 31 is converted into the linear motion of the piston rod 12 through the screw 13 and the nut 14. When the hydraulic motor 31 stops rotating, the screw 13 and nut 14 achieve position self-locking, ensuring that the extension length of the piston rod 12 remains unchanged. The piston rods of the first spiral propulsion cylinder 01 and the second spiral propulsion cylinder 02 fully extend and retract, corresponding to the two working states of the worktable 06: unfolding and retracting. When the mechanically synchronized and locking spiral drive device of this invention is applied to drive the worktable 06, it drives the worktable 06 to flip up and down. After flipping to a horizontal state, the screw 13 and nut 14 reliably maintain the position, ensuring the safety of personnel and equipment on the platform. It can also be used in situations such as dual-cylinder driven load lifting and leveling, and lifting and lowering, all with high reliability and safety.

[0023] Optionally, such as Figure 3 , Figure 4As shown, the synchronous shaft assembly 05 includes a first right-angle gearbox 51, a first coupling 52, a second right-angle gearbox 53, a second coupling 54, and a synchronous shaft body 55. The first right-angle gearbox 51 houses a first bevel gear 511 and a second bevel gear 512. The first bevel gear 511 is driven by the gearbox drive gear 32, and the second bevel gear 512 meshes with the first bevel gear 511. The second bevel gear 512 is connected to the output shaft 513 of the first right-angle gearbox. The second right-angle gearbox 53 houses a third bevel gear 531 and a fourth bevel gear 532. The third bevel gear 531 is driven by the gearbox drive gear of the second spiral propulsion cylinder 02. The fourth bevel gear 532 meshes with the third bevel gear 531. The fourth bevel gear 532 is connected to the output shaft 533 of the second right-angle gearbox. The output shaft 513 of the first right-angle gearbox is connected to the synchronous shaft body 55 through the first coupling 52. The output shaft 533 of the second right-angle gearbox is connected to the synchronous shaft body 55 through the second coupling 54. The first bevel gear 511 and the third bevel gear 531 have the same rotation direction. The second bevel gear 512 and the fourth bevel gear 532 have opposite rotation directions. Specifically, the synchronous shaft body 55 is connected to two shaft supports 57 via bearings. When the two hydraulic motors rotate clockwise, the gearbox drive gear 32 drives the first bevel gear 511 to rotate to the right, causing the second bevel gear 512 to drive the first right-angle gearbox output shaft 513 to rotate upwards (clockwise). The second right-angle gearbox output shaft 533 rotates upwards (counterclockwise) under the drive of the fourth bevel gear 532. The synchronous shaft body 55 rotates upwards via the first coupling 52 and the second coupling 54. Simultaneously, the first coupling 52 and the second coupling 54 are used to accommodate the coaxiality deviation between the first right-angle gearbox output shaft 513 and the second right-angle gearbox output shaft 533, reducing assembly requirements. When the mechanical synchronization and locking screw drive device of this invention is applied to drive the worktable 06, the synchronous shaft assembly can ensure the synchronous speed of the two screw propulsion cylinders during the up-and-down rotation of the worktable 06, eliminating the need for a dedicated hydraulic control valve or electrical control system for synchronization control. The system is simple and reliable.

[0024] Optionally, a brake 56 is also provided on the synchronous shaft body 55. A brake disc 551 is provided on the synchronous shaft body 55, and the brake 56 is a hydraulic caliper brake fixed to the base. When there is no oil pressure, the brake 56 grips the brake disc 551; when there is oil pressure, the brake 56 releases the brake disc 551. Before the first spiral propulsion cylinder 01 and the second spiral propulsion cylinder 02 are started, the brake 56 releases the brake disc 551 by energizing it with oil. After the first spiral propulsion cylinder 01 and the second spiral propulsion cylinder 02 are started, the synchronous shaft body 55 can rotate freely. After the first spiral propulsion cylinder 01 and the second spiral propulsion cylinder 02 stop, the brake 56 releases pressure and grips the brake disc 551, preventing the synchronous shaft body 55 from rotating. This provides braking protection for the first spiral propulsion cylinder 01 and the second spiral propulsion cylinder 02, preventing abnormal retraction of the spiral propulsion cylinders under impact loads, enhancing the position holding capability of the spiral drive device, and reliably maintaining the worktable 06 or other loads in a horizontal position. The brake 56 is equipped with proximity switches 561 and 562 for issuing braking and release signals. By incorporating the brake 56, the mechanically synchronized and locking helical drive device of this invention is further enhanced to achieve reliable position holding when applied to the worktable 06, ensuring the safety of personnel and equipment on the worktable 06. Optionally, it also includes a hydraulic control circuit 07, such as Figure 5As shown, the hydraulic control circuit 07 includes an oil source 71, a three-position four-way solenoid directional valve 72, a speed control valve 73, a main oil supply pipe 81, a main oil return pipe 85, a first working pipe 82, a first working branch pipe 83, a second working branch pipe 84, a second working pipe 86, a third working branch pipe 87, and a fourth working branch pipe 88. The oil source 71 is connected to the P port and T port of the three-position four-way solenoid directional valve 72 via the main oil supply pipe 81 and the main oil return pipe 85, respectively. One end of the first working branch pipe 83 is connected to the working port A of the first hydraulic motor 31, and the other end is connected to the end of the first working pipe 82. One end of the second working branch pipe 84 is connected to the working port A of the hydraulic motor of the second screw propulsion cylinder 02, and the other end is connected to the end of the first working pipe 82. The starting end of the first working pipe 82 is connected to the A port of the three-position four-way solenoid directional valve 72. The third working branch 87 is connected at one end to the working port B of the hydraulic motor 31 and at the other end to the end of the second working pipeline 86. The fourth working branch 88 is connected at one end to the working port B of the hydraulic motor of the second spiral propulsion cylinder 02 and at the other end to the end of the second working pipeline 86. The starting end of the second working pipeline 86 is connected to port B of the three-position four-way solenoid directional valve 72. Speed ​​control valve 73 is installed on the oil supply main pipe 81. Speed ​​control valve 73 is used to adjust the oil inlet flow of three-position four-way solenoid directional valve 72 and change the extension and retraction speed of the first and second spiral propulsion cylinders. By controlling the oil circuit opening and closing and the oil flow direction through three-position four-way solenoid directional valve 72, the forward and reverse rotation of the two hydraulic motors is controlled, thereby changing the movement direction of the piston rods of the first spiral propulsion cylinder 01 and the second spiral propulsion cylinder 02. The two hydraulic motors are connected in parallel on the oil circuit. The oil circuit automatically distributes the flow required by the two hydraulic motors, eliminating the difference in displacement and volumetric efficiency between the two hydraulic motors. Furthermore, when the mechanical efficiency of one hydraulic motor decreases due to factors such as slight jamming, the other hydraulic motor can compensate for its power loss through the synchronous shaft assembly 05.

[0025] Optionally, it also includes a one-way throttle valve 74, which is disposed on the second working pipeline 86. When the piston rods of the first spiral propulsion cylinder 01 and the second spiral propulsion cylinder 02 retract, the oil output from the two hydraulic motors flows through the one-way throttle valve 74, increasing the back pressure of the oil output from the two hydraulic motors and preventing vibration when the first spiral propulsion cylinder 01 and the second spiral propulsion cylinder 02 are retracted under load. When the spiral drive device of the present invention with mechanical synchronization and locking is applied to drive the worktable 06, the movement is smooth when the worktable 06 is tilted down, without vibration or crawling.

[0026] Optionally, the system also includes multiple manual shut-off valves. A first connecting pipe is provided between the first working branch 83 and the third working branch 87, and a second connecting pipe is provided between the second working branch 84 and the fourth working branch 88. A manual shut-off valve is installed on each of the first working branch 83, the third working branch 87, the second working branch 84, the fourth working branch 88, the first connecting pipe, and the second connecting pipe. When one hydraulic motor fails, the oil circuit between that hydraulic motor and the directional valve is disconnected, and the A and B working oil ports of that hydraulic motor are short-circuited. The extension and retraction of the two spiral propulsion cylinders are then completed by another hydraulic motor. For example, when the hydraulic motor 31 of the first spiral propulsion cylinder 01 fails, the manual shut-off valves JK1 and JK2 are closed, and JK3 is opened to short-circuit the A and B ports of the hydraulic motor 31. The hydraulic motor 31 is disconnected from the circuit, and all the oil flows through the hydraulic motor of the second spiral propulsion cylinder 02. While the hydraulic motor of the second spiral propulsion cylinder 02 drives the second spiral propulsion cylinder 02 to extend and retract, the first spiral propulsion cylinder 01 is driven to extend and retract synchronously through the synchronous shaft assembly 05, thereby improving the reliability of the spiral drive device of the present invention for mechanical synchronization and locking.

[0027] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A screw drive device for mechanical synchronization and locking, characterized in that, The system includes a first spiral propulsion cylinder (01), a second spiral propulsion cylinder (02), and a synchronous shaft assembly (05). The first spiral propulsion cylinder (01) includes a cylinder body (11), a piston rod (12), a screw (13), a nut (14), and a screw drive assembly (03). The piston rod (12) is disposed inside the cylinder body (11) and is a hollow component. The screw (13) extends partially into the piston rod (12). The nut (14) is threaded onto the screw (13), and the piston rod (12) and the nut (14) are fixedly connected. The screw drive assembly (03) is connected to the end of the screw (13) located outside the piston rod (12). 03) Drive the screw (13) to rotate, so that the nut (14) drives the piston rod (12) to extend or retract. The second spiral propulsion cylinder (02) has the same structure as the first spiral propulsion cylinder (01). The screw of the second spiral propulsion cylinder (02) has the same thread direction as the screw (13) of the first spiral propulsion cylinder (01). The piston rods of the first spiral propulsion cylinder (01) and the second spiral propulsion cylinder (02) are both used to hinge to the load. The synchronous shaft assembly (05) is connected between the first spiral propulsion cylinder (01) and the second spiral propulsion cylinder (02), so that the piston rods of the first spiral propulsion cylinder (01) and the second spiral propulsion cylinder (02) move synchronously.

2. The screw drive device for mechanical synchronization and locking according to claim 1, characterized in that, The screw drive assembly (03) includes a hydraulic motor (31), a gearbox drive gear (32), and a gearbox driven gear (33). The gearbox drive gear (32) is connected to the output shaft of the hydraulic motor (31), and the gearbox driven gear (33) meshes with the gearbox drive gear (32). The gearbox driven gear (33) is connected to one end of the screw (13) located outside the piston rod (12).

3. The mechanically synchronized and locking screw drive device according to claim 2, characterized in that, The screw (13) is a trapezoidal screw, and the nut (14) is a trapezoidal nut.

4. The screw drive device for mechanical synchronization and locking according to claim 3, characterized in that, It also includes an extension-to-position proximity switch (15) and a receiving-to-position proximity switch (16). The extension-to-position proximity switch (15) and the receiving-to-position proximity switch (16) are both connected to the cylinder body (11). The extension-to-position proximity switch (15) is close to the end position of the nut (14) relative to the screw (13), and the receiving-to-position proximity switch (16) is close to the starting position of the nut (14). When the piston rod (12) extends to the position or retracts to the position, the extension-to-position proximity switch (15) and the receiving-to-position proximity switch (16) respectively issue extension-to-position information or retraction-to-position information of the piston rod (12).

5. The mechanically synchronized and locking screw drive device according to claim 4, characterized in that, One end of the first spiral propulsion cylinder (01) and the second spiral propulsion cylinder (02) are both hinged to the support (04).

6. The mechanically synchronized and locking screw drive device according to claim 5, characterized in that, The synchronous shaft assembly (05) includes a first right-angle gearbox (51), a first coupling (52), a second right-angle gearbox (53), a second coupling (54), and a synchronous shaft body (55). The first right-angle gearbox (51) contains a first bevel gear (511) and a second bevel gear (512). The first bevel gear (511) is driven by the gearbox drive gear (32). The second bevel gear (512) meshes with the first bevel gear (511) and is connected to the output shaft (513) of the first right-angle gearbox. The second right-angle gearbox (53) contains a third bevel gear (531) and a fourth bevel gear (532). The bevel gear (531) is driven by the gearbox drive gear of the second spiral propulsion cylinder (02). The fourth bevel gear (532) meshes with the third bevel gear (531). The fourth bevel gear (532) is connected to the output shaft (533) of the second right-angle gearbox. The output shaft (513) of the first right-angle gearbox is connected to the synchronous shaft body (55) through the first coupling (52). The output shaft (533) of the second right-angle gearbox is connected to the synchronous shaft body (55) through the second coupling (54). The first bevel gear (511) and the third bevel gear (531) have the same rotation direction. The second bevel gear (512) and the fourth bevel gear (532) have opposite rotation directions.

7. The mechanically synchronized and locking screw drive device according to claim 6, characterized in that, A brake (56) is also provided on the synchronous shaft body (55).

8. The screw drive device for mechanical synchronization and locking according to claim 7, characterized in that, It also includes a hydraulic control circuit (07), which includes an oil source (71), a three-position four-way solenoid directional valve (72), a speed control valve (73), a main oil supply pipe (81), a main oil return pipe (85), a first working pipeline (82), a first working branch (83), a second working branch (84), a second working pipeline (86), a third working branch (87), and a fourth working branch (88). The oil source (71) is connected to the P port and T port of the three-position four-way solenoid directional valve (72) through the main oil supply pipe (81) and the main oil return pipe (85), respectively. One end of the first working branch (83) is connected to the working port A of the first hydraulic motor (31), and the other end is connected to the end of the first working pipeline (82). The second working branch (84) is connected to the P port and T port of the first-position four-way solenoid directional valve (72) through the main oil supply pipe (81) and the main oil return pipe (85), respectively. 4) One end is connected to the working port A of the hydraulic motor of the second spiral propulsion cylinder (02), and the other end is connected to the end of the first working pipeline (82). The starting end of the first working pipeline (82) is connected to the A port of the three-position four-way solenoid directional valve (72). One end of the third working branch (87) is connected to the working port B of the hydraulic motor (31), and the other end is connected to the end of the second working pipeline (86). One end of the fourth working branch (88) is connected to the working port B of the hydraulic motor of the second spiral propulsion cylinder (02), and the other end is connected to the end of the second working pipeline (86). The starting end of the second working pipeline (86) is connected to the B port of the three-position four-way solenoid directional valve (72). The speed regulating valve (73) is set on the oil supply main pipe (81).

9. The screw drive device for mechanical synchronization and locking according to claim 8, characterized in that, It also includes a one-way throttle valve (74), which is disposed on the second working pipeline (86).

10. The screw drive device for mechanical synchronization and locking according to claim 9, characterized in that, It also includes multiple manual shut-off valves. A first connecting pipe is provided between the first working branch (83) and the third working branch (87), and a second connecting pipe is provided between the second working branch (84) and the fourth working branch (88). A manual shut-off valve is provided on the first working branch (83), the second working branch (84), the third working branch (87), the fourth working branch (88), the first connecting pipe, and the second connecting pipe, respectively.

Images