An integrated mechanism for dead-point disengagement, deployment, and retraction of a scissor lift device.

Abstract

This invention provides an integrated mechanism for the deployment and retraction of a scissor lift device at its dead point, relating to the field of combined aerospace vehicle technology. It includes a drive unit and a dead-point thrust mechanism, with the drive unit and the dead-point thrust mechanism being drive-driven. The drive unit can drive the dead-point thrust mechanism to lift the rod at the dead point position upwards. The support portion of the dead-point thrust mechanism can slide to accommodate the horizontal movement of the rod, and the support portion also supports the retracted rod of the scissor lift device. The solution provided by this invention offers another driving force when the directions of the scissor lift rod and the driving force coincide. This driving force helps the scissor lift rod cross the dead point position, ensuring normal operation of the scissor lift device, and also supports the retracted rod of the scissor lift device.

Description

Technical Field

[0001] This invention relates to the field of combined aerospace vehicle technology, and in particular to an integrated mechanism for the dead-point disengagement, deployment, and retraction of a scissor lift device. Background Technology

[0002] Scissor lift mechanisms are widely used in the field of aerospace vehicles. In application, the scissor lifts the second-stage vehicle to a certain height relative to the first-stage vehicle before separation, allowing the second-stage vehicle to achieve an elevation angle and obtain better aerodynamic conditions, ensuring normal flight after separation. However, this mechanism has an unavoidable dead point in the initial stage of operation; that is, when the two links of the scissor lift mechanism overlap, the driving force applied to the links is parallel to the links, preventing the mechanism from functioning properly.

[0003] To help the scissor lift mechanism successfully overcome the dead-point position, a device needs to be designed to provide the force required to escape the dead-point position without interfering with the original operation of the scissor lift mechanism. Because the mechanical environment during aerospace vehicle flight is extremely complex, providing force according to operating conditions using traditional control methods places high demands on control forces. Therefore, this device needs to meet the requirement of escaping the dead-point position from a mechanical perspective, reducing the design complexity of the control system and minimizing errors in the overall mechanism during operation. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated mechanism for the deployment and retraction of a scissor lift mechanism at its dead point, thereby solving the problems existing in the prior art. When the directions of the scissor lift mechanism members and the driving force coincide, another driving force is provided. This driving force can help the scissor lift mechanism members cross the dead point position, ensuring the normal operation of the scissor lift mechanism, and can also support the retracted scissor lift mechanism members.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides an integrated mechanism for the dead-point disengagement, deployment, and retraction of a scissor lift device, comprising a drive device and a dead-point thrust mechanism. The drive device is pulsatorically connected to the dead-point thrust mechanism. The drive device can drive the dead-point thrust mechanism to lift the rod at the dead-point position upward. The support portion of the dead-point thrust mechanism can slide to accommodate the horizontal movement of the rod. The support portion is also used to support the retracted rod of the scissor lift device.

[0007] Preferably, two dead-point thrust mechanisms and one drive device are provided. The drive device is driven by a motor and is connected to the two dead-point thrust mechanisms through a worm gear structure.

[0008] Preferably, a return mechanism is also provided, which can drive the support part to return to its initial position after the work is completed.

[0009] Preferably, the drive device includes a motor, two screws and a matching coupling. The motor shaft, one screw and the other screw are connected in sequence through the coupling. The motor shaft and the screws are engaged with the shaft base through bearings.

[0010] Preferably, the dead-point thrust mechanism includes the support part, a main rotating shaft, a secondary rotating shaft, a base, and two power sliders. The base is fixedly installed. The main rotating shaft and the secondary rotating shaft are arranged side by side and are rotatably mounted on the base around a vertical axis. A worm gear is coaxially mounted on the main rotating shaft, and the worm gear is in transmission contact with the worm. The main rotating shaft and the secondary rotating shaft are connected by a gear set. The upper part of the main rotating shaft and the secondary rotating shaft is a threaded transmission rod. The two threaded transmission rods are respectively threadedly connected to the two power sliders to drive the power sliders to move up and down. A support plate is fixedly installed on the top of the two power sliders, and the support part is slidably mounted on the support plate.

[0011] Preferably, it also includes a base plate, on which the motor, the shaft base, and the base are all fixedly mounted. The base includes a base, a lower base, a middle base, and an upper base arranged sequentially from bottom to top. The main rotating shaft is a rotating shaft with a variable diameter, which gradually decreases in diameter from bottom to top. The diameter of the main rotating shaft, from large to small, respectively matches the through holes on the base, the lower base, the middle base, and the upper base.

[0012] Preferably, it also includes a guide sleeve, which is fixedly mounted on the upper base, and the power slider is disposed inside the guide sleeve and can slide up and down inside the guide sleeve.

[0013] Preferably, the return mechanism is a rope drive mechanism, in which a motor is mounted on a power slider. One end of the rope in the rope drive mechanism is fixed to the motor shaft, and the other end is fixed to the support. When the support completes its working stroke, the rope drive mechanism pulls the support back to its initial position, thereby completing the initialization of the support.

[0014] Preferably, the support is a thrust bracket with an upwardly curved arc shape.

[0015] The present invention achieves the following technical effects compared to the prior art:

[0016] 1. This invention can help the scissor lift device out of the dead position, thereby ensuring the normal operation of the scissor lift device.

[0017] 2. In the prior art, when lifting the scissor lift device, the support part only moves up and down, which causes the contact position between the two to be constantly changing, resulting in unstable force and easy damage. However, the support part of the device provided by the present invention can slide to adapt to the amount of horizontal movement of the rod, the contact position is constant, and the support part can provide a constant upward force by changing its position, resulting in stable force and easy control of the lifting process.

[0018] 3. In the field of existing aerospace vehicles, scissor lift devices often have multiple support points below them to fix and support the retracted scissor lift device rods. The support part in the integrated mechanism for dead-point disengagement, deployment, and retraction of the scissor lift device provided in this application is used to replace one, two, or more support points to fix and support the retracted scissor lift device rods. In other words, this invention is an improvement on the original support points so that they not only have a supporting function but also a supporting function.

[0019] 4. The entire mechanism uses a single motor to provide driving force, reducing the design difficulty of the mechanism control system.

[0020] 5. This integrated mechanism for the dead-point disengagement, deployment, and retraction of the scissor lift device can be used not only for scissor lift structures, but also, after improvement, for various structures with dead-point positions, making the device highly adaptable. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram showing the position of the integrated mechanism for dead-point disengagement, deployment, and retraction of the scissor lift device in the scissor lift device according to the present invention.

[0023] Figure 2 This is a structural diagram of an integrated mechanism used for the dead-point disengagement, deployment, and retraction of the scissor lift device.

[0024] Figure 3 This is a schematic diagram of the drive unit;

[0025] Figure 4 It is a schematic diagram of the coupling and motor shaft mating structure and a radial cross-sectional view;

[0026] Figure 5 This is a schematic diagram of the coupling connection method and a partial enlarged view;

[0027] Figure 6 This is a schematic diagram of the dead-point thrust mechanism.

[0028] Figure 7 These are the front view and sectional view of the dead-point thrust mechanism;

[0029] Figure 8 This is a schematic diagram of the main rotating shaft structure;

[0030] Figure 9 This is a schematic diagram of the secondary shaft structure;

[0031] Figure 10 This is a schematic diagram of the base structure;

[0032] Figure 11 This is a schematic diagram of the lower base structure;

[0033] Figure 12 This is a schematic diagram of the base structure;

[0034] Figure 13 This is a schematic diagram of the upper base structure;

[0035] Figure 14 This is a schematic diagram of the guide sleeve structure;

[0036] Figure 15 This is a schematic diagram of the worm gear structure in the base;

[0037] Figure 16 This is a schematic diagram of the gear structure in the upper base;

[0038] Figure 17 This is a schematic diagram of the thrust mechanism;

[0039] Figure 18 This is a schematic diagram showing the installation position of the return mechanism;

[0040] Wherein, 100-drive device; 101-motor; 102-motor shaft; 103-screw; 104-coupling; 1041-long pin; 1042-cotter pin; 1043-bolt for fixing the shaft; 1044-bolt for fixing the coupling; 1045-connecting screw hole; 1046-pin hole; 105-bearing; 200-dead-point thrust mechanism; 201-main shaft; 202-auxiliary shaft; 203-base; 204-Lower base; 205-Middle base; 206-Upper base; 207-Guide sleeve; 208-Transmission assembly; 2081-Worm gear; 2082-Thrust bearing; 2091-Power slider; 2092-Support plate; 2093-Slide rail; 2094-Support part; 2095-Return mechanism; 20951-Return motor; 20952-Rope; 300-Scissor lift device; 301-Rod; 302-Support point. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] The purpose of this invention is to provide an integrated mechanism for the deployment and retraction of a scissor lift mechanism at its dead point, thereby solving the problems existing in the prior art. When the directions of the scissor lift mechanism members and the driving force coincide, another driving force is provided. This driving force can help the scissor lift mechanism members cross the dead point position, ensuring the normal operation of the scissor lift mechanism, and can also support the retracted scissor lift mechanism members.

[0043] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] This invention provides an integrated mechanism for the dead-point disengagement, deployment, and retraction of a scissor lift device, such as... Figures 1 to 18 As shown, the device includes a drive unit 100 and a dead-point thrust mechanism 200. The drive unit 100 can be electrically driven or hydraulically driven. In a specific embodiment of the present invention, it is electrically driven. The drive unit 100 is connected to the dead-point thrust mechanism 200. The drive unit 100 can drive the dead-point thrust mechanism 200 to lift the rod 301, which is in the dead-point position, upward. The support portion 2094 of the dead-point thrust mechanism 200 can slide to accommodate the horizontal movement of the rod 301. The horizontal movement of the rod 301 is the same as the horizontal movement of the support portion 2094, and the support portion 2094 moves passively horizontally, moving with the movement of the rod 301. The support portion 2094 is also used to support the rod 301 of the retracted scissor lift device 300. In a preferred embodiment, the support portion 2094 is a thrust bracket with an upwardly curved arc shape to accommodate the shape of the rod 301. Figure 1 As shown, while the scissor lift device 300 is raised, the lever 301 not only moves up and down, but also moves horizontally.

[0045] The device provided by the present invention can help the scissor lift device 300 out of the dead position, thereby ensuring the normal operation of the scissor lift device 300.

[0046] In addition, in the prior art, when the lever 301 in the scissor lift device 300 is lifted, the support part 2094 only moves up and down, which causes the contact position between the two to be constantly changing, resulting in unstable force and easy damage. However, the support part 2094 in the device provided by the present invention can slide to adapt to the amount of movement of the lever 301 in the horizontal direction, the contact position is constant, the force is stable, and the lifting process is easy to control.

[0047] Furthermore, in the existing field of aerospace vehicles, scissor lift devices 300 often have multiple support points 302 below them to fix and support the retracted rods 301 of the scissor lift device 300. However, the support part 2094 in the integrated mechanism for the dead point disengagement, deployment, and retraction of the scissor lift device provided in this application is used to replace one, two, or more support points 302 to fix and support the retracted rods 301. In other words, this invention is an improvement on the original support point 302 so that it not only has a supporting function but also a supporting function.

[0048] In specific embodiments, such as Figure 1 and Figure 2 As shown, there are two dead-point thrust mechanisms 200 and a drive device 100. The drive device 100 is driven by a motor 101. The drive device 100 is connected to the two dead-point thrust mechanisms 200 through a worm gear structure. The entire mechanism uses a single motor 101 to provide driving force, which reduces the design difficulty of the mechanism control system. At the same time, in order to ensure the synchronization of the two dead-point thrust mechanisms 200, a drive shaft is used to connect the two dead-point thrust mechanisms 200, which mechanically ensures that the dead-point thrust mechanisms 200 provide synchronized driving force.

[0049] In specific embodiments, such as Figure 18 As shown, this embodiment also includes a return mechanism 2095. After the work is completed, the return mechanism 2095 can drive the support part 2094 to return to the initial position, so as to support the rod 301 and perform dead point boost again.

[0050] In specific embodiments, such as Figure 3As shown, the drive unit 100 includes a motor 101, two screws 103, and a matching coupling 104. The motor shaft 102 of the motor 101, one screw 103, and the other screw 103 are connected sequentially by the coupling 104. The motor shaft 102 and the screw 103 of the motor 101 are fitted to the shaft base by bearings 105, which are ball bearings. The coupling 104 is used for connecting adjacent shafts. Each shaft end is designed with a cross-shaped structure for mating with the coupling 104. The coupling 104 is tightly fitted with the motor shaft 102 and the screw 103 by two long pins 1041. The two ends of the long pins 1041 are fixed by two cotter pins 1042. Pre-drilled holes are provided at the coupling 104 for bolt connection between the coupling 104 and the screws 103, strengthening the connection between the shafts. Furthermore, the two mating couplings 104 are also fixed by four bolts.

[0051] In specific embodiments, such as Figure 6 and Figure 7 As shown, the dead-point thrust mechanism 200 includes a support 2094, a main rotating shaft 201, a secondary rotating shaft 202, a base, and two power sliders 2091. The base is fixedly installed. The main rotating shaft 201 and the secondary rotating shaft 202 are arranged side by side and are rotatably mounted on the base around a vertical axis, connected by bearings. A worm gear 2081 is coaxially mounted on the main rotating shaft 201, and the worm gear 2081 is in contact with the worm drive. The main rotating shaft 201 and the secondary rotating shaft 202 are connected by a gear set. The upper part of the main rotating shaft 201 and the secondary rotating shaft 202 is a threaded drive rod. The two threaded drive rods are respectively threadedly connected to the two power sliders 2091 to drive the power sliders 2091 to move up and down. The top of the two power sliders 2091 A support plate 2092 is fixedly installed, and a support part 2094 is slidably mounted on the support plate 2092 via a slide rail 2093. A worm gear 2081 and a worm transmit the torque of the motor 101 to the main shaft 201, and a gear set transmits the torque of the main shaft 201 to the auxiliary shaft 202. The main shaft 201 and the auxiliary shaft 202 rotate synchronously to drive the support part 2094 to move up and down. Specifically, both the main shaft 201 and the auxiliary shaft 202 are equipped with a large gear, and a small gear is provided between the two large gears to connect them. The two large gears have the same number of teeth and size. Anti-rotation protrusions are provided on the parts of the main shaft 201 and the auxiliary shaft 202 that mate with the gears. Each gear has a thrust bearing 2082 installed on its upper and lower mating surfaces to reduce wear.

[0052] In specific embodiments, such as Figure 6 and Figure 7As shown, it also includes a base plate. The motor 101, shaft base 203, and base are all fixedly mounted on the base plate. The base includes a base 203, a lower base 204, a middle base 205, and an upper base 206 arranged sequentially from bottom to top. The main rotating shaft 201 is a rotating shaft with a variable diameter, which gradually decreases from bottom to top. The diameter of the main rotating shaft 201 decreases from large to small and respectively matches the through holes on the base 203, the lower base 204, the middle base 205, and the upper base 206. The base 203 is fixed to the base plate with bolts through four reserved bolt holes. The base 203 has a groove in the middle for cooperating with the main shaft 201. The lower part of the main shaft 201 is set in the groove in the middle of the base 203. The bottom of the main shaft 201 is provided with a flange extending outward. The lower base 204 is fixedly set on the base 203 and limits the flange at the bottom of the main shaft 201 to the groove of the base 203, so as to limit the upper and lower movement of the main shaft 201, but cannot limit its rotation.

[0053] The lower base 204 is also fixed to the base plate with bolts through four reserved bolt holes. The bolt holes of the lower base 204 and the bolt holes of the base 203 are coaxial in space during installation. The corresponding bolt holes are fixed with a single bolt. The lower base 204 has a through hole in the middle for mating with the main rotating shaft 201. A circular groove is opened next to the through hole for installing the thrust bearing 2082 that mates with the gear structure. The lower base 204 is also designed with two small protrusions for mating with the middle base 205 to prevent the middle base 205 from shifting after installation and affecting the operation of the mechanism.

[0054] The through hole in the middle of the middle base 205 is used to mate with the main rotating shaft 201. A circular groove is reserved around the middle through hole for mate with the thrust bearing 2082 of the gear structure. Two columns extend downward from the side of the middle base 205. These two columns and the square groove reserved in the base plate are used to support the middle base 205. A plum blossom-shaped groove and a circular groove are reserved on the top of the middle base 205. The plum blossom-shaped groove is used to fix the small rotating shaft in the pinion structure. The circular groove is used to mate with the auxiliary rotating shaft 202. Four threaded holes are also designed on the upper surface of the middle base 205 for fixing the upper base 206.

[0055] The upper surface of the upper base 206 has two through holes for mating with the main shaft 201 and the auxiliary shaft 202. The lower surface of the upper base 206 has two protruding structures around the through holes for mating with the thrust bearing 2082 in the gear structure. The upper surface of the upper base 206 has four through hole threaded grooves and four non-through hole threaded grooves for fixing the upper base 206.

[0056] In specific embodiments, such as Figure 14As shown, it also includes a guide sleeve 207, which is fixedly mounted on the upper base 206. The power slider 2091 is disposed inside the guide sleeve 207 and can slide up and down inside the guide sleeve 207 to improve the stability of the up and down sliding. The guide sleeve 207 is formed by four vertical plates. The plane and vertical surfaces of the guide sleeve 207 are chamfered to ensure the structural strength of the vertical plates. Four threaded holes are designed on the periphery of the guide sleeve 207 to fix the guide sleeve 207 to the upper base 206.

[0057] In a specific embodiment, the return mechanism 2095 is a rope drive mechanism. The return motor 20951 in the rope drive mechanism is mounted on a power slider 2091. One end of the rope 20952 in the rope drive mechanism is fixed to the motor shaft, and the other end is fixed to the support part 2094. When the support part 2094 completes its working stroke, the rope drive mechanism pulls the support part 2094 back to its initial position, thereby completing the initialization of the support part 2094 and preparing it for the next working stroke.

[0058] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An integrated mechanism for the dead-point disengagement, deployment, and retraction of a scissor lift device, characterized in that: The device includes a drive unit and a dead-point thrust mechanism. The drive unit is connected to the dead-point thrust mechanism and can drive the dead-point thrust mechanism to lift the rod at the dead-point position upwards. The support part of the dead-point thrust mechanism can slide to accommodate the horizontal movement of the rod. The support part also supports the rod of the retracted scissor lift device. Two dead-point thrust mechanisms and one drive unit are provided. The drive unit is driven by a motor and is connected to the two dead-point thrust mechanisms via a worm gear structure. A return mechanism is also provided, which can drive the support part to return to its initial position after operation. The drive unit includes a motor, two screws, and a matching coupling. The motor shaft, one screw, and... Another screw is connected in sequence via the coupling. The motor shaft and the screw are coupled to the shaft base via bearings. The dead-point thrust mechanism includes the support part, main shaft, auxiliary shaft, base, and two power sliders. The base is fixedly installed. The main shaft and the auxiliary shaft are arranged side by side and are rotatably mounted on the base around a vertical axis. A worm gear is coaxially mounted on the main shaft. The worm gear is in transmission contact with the worm. The main shaft and the auxiliary shaft are connected by a gear set. The upper part of the main shaft and the auxiliary shaft is a threaded transmission rod. The two threaded transmission rods are respectively threadedly connected to the two power sliders to drive the power sliders to move up and down. A support plate is fixedly installed on the top of the two power sliders. The support part is slidably mounted on the support plate.

2. The integrated mechanism for dead-point disengagement, deployment, and retraction of a scissor lift device according to claim 1, characterized in that: It also includes a base plate, on which the motor, the shaft base, and the base are all fixedly mounted. The base includes a base, a lower base, a middle base, and an upper base arranged sequentially from bottom to top. The main rotating shaft is a rotating shaft with a variable diameter, which gradually decreases in diameter from bottom to top. The diameter of the main rotating shaft, from large to small, respectively matches the through holes on the base, the lower base, the middle base, and the upper base.

3. The integrated mechanism for dead-point disengagement, deployment, and retraction of a scissor lift device according to claim 2, characterized in that: It also includes a guide sleeve, which is fixedly mounted on the upper base, and the power slider is disposed inside the guide sleeve and can slide up and down inside the guide sleeve.

4. The integrated mechanism for dead-point disengagement, deployment, and retraction of a scissor lift device according to claim 1, characterized in that: The return mechanism is a rope-driven mechanism. The motor in the rope-driven mechanism is mounted on a power slider. One end of the rope in the rope-driven mechanism is fixed to the motor shaft, and the other end is fixed to the support. When the support completes its working stroke, the rope-driven mechanism pulls the support back to its initial position, thereby completing the initialization of the support.

5. The integrated mechanism for dead-point disengagement, deployment, and retraction of a scissor lift device according to claim 1, characterized in that: The support is a thrust bracket with an upwardly curved arc shape.

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