Linkage locking device for rotary table and lifting mechanism

Abstract

The invention discloses a rotary table and lifting mechanism linkage locking device. According to the locking device, a sliding block and a guide rail are arranged at the top of a lifting mechanism; the rotary table is provided with a rotary table locking hole; the pulley fixing seat is fixedly connected with the two sliding blocks; the pulley is rotationally mounted on the pulley fixing seat; the locking rod can be movably mounted on the base in the vertical direction through the guide seat and the pressing mechanism, and is aligned with the rotary table locking hole in the vertical direction when the rotary table is located at the zero position; the reversing mechanism is used for converting left-right movement of the sliding block into up-down movement of the locking rod through the pulley fixing base and the pulley, so that the top end of the locking rod stretches into the rotary table locking hole to achieve locking when the lifting mechanism descends, and retreats from the rotary table locking hole to achieve unlocking when the lifting mechanism ascends. The pressing mechanism is fixedly installed on the base and used for enabling the bottom end of the locking rod to abut against the reversing mechanism all the time so as to prevent the locking rod from shaking up and down. The locking device does not need to add electric devices, does not consume power and is high in reliability.

Description

Technical Field

[0001] The invention relates to the technical field of locking, and in particular to a locking device for a rotating table and a lifting mechanism. Background Art

[0002] At present, there are many optoelectronic turntables in the military industry that are used together with lifting mechanisms. In the non-working state, the lifting mechanism drops to the lowest position, driving the turntable down to the inside of the vehicle cabin, which not only protects the turntable, but also reduces the total height of the vehicle so that it does not exceed the height, allowing the equipment vehicle to pass through height-restricted areas such as culverts and tunnels. When the turntable needs to work, the lifting mechanism drives the turntable to the highest point, and the turntable is exposed to a certain height above the roof, so that the turntable can work normally.

[0003] When the turntable is in the cabin, the turntable azimuth axis system needs to be locked to prevent the turntable from shaking and colliding with the cabin and causing damage. The commonly used method is to use an electromagnet as a locking device. After the lifting mechanism is lowered into place, the electromagnet is powered off. Under the action of the spring restoring force, the locking pin of the electromagnet is inserted into the locking hole of the turntable axis system to lock the turntable axis system; after the lifting mechanism rises into place, the electromagnet is powered on, and under the action of the electromagnetic force, the locking pin is pulled out to restore the turntable axis system. However, the existing locking method has many disadvantages: First, the electromagnet needs to be powered on all the time when the turntable is working. The electromagnet generates a lot of heat in the working state, often reaching more than 60°C, which puts a great burden on the equipment cooling system and power supply system; second, the reliability is not high. When the program or power supply sequence is wrong, it will cause the electromagnet to open or lock accidentally, causing equipment failure. Summary of the invention

[0004] In order to overcome the shortcomings of low reliability and high heat generation of the existing locking mechanism, the present invention provides a locking device that links a turntable with a lifting mechanism. The locking device is linked with the lifting mechanism to convert the left and right movement of the slider into the up and down movement of the locking rod. No electrical components need to be added and no electricity is consumed. When the lifting mechanism rises, the locking rod is pulled out and unlocks the turntable under the action of mechanical linkage. When the lifting mechanism descends, the locking rod is inserted into the turntable locking hole of the turntable under the action of mechanical linkage, thereby locking the turntable. The reliability is high.

[0005] In order to achieve the above object, the present invention adopts the following specific technical solutions:

[0006] A locking device for a turntable and a lifting mechanism linkage, the locking device for a turntable and a lifting mechanism comprising a lifting mechanism, a turntable, a pulley fixing seat, a pulley, a reversing mechanism, a guide seat, a clamping mechanism and a locking rod;

[0007] The turntable, the base and the lifting mechanism are arranged in sequence from top to bottom along the vertical direction;

[0008] The top of the lifting mechanism is provided with two pairs of sliding blocks and guide rails that are slidably matched, and is used to achieve lifting by sliding the sliding blocks along the guide rails;

[0009] The turntable is provided with a turntable locking hole;

[0010] The pulley fixing seat is fixedly connected to the two sliding blocks;

[0011] The pulley is rotatably mounted on the pulley fixing seat and is used to drive the reversing mechanism;

[0012] The locking rod is mounted on the base in a vertically movable manner through the guide seat and the clamping mechanism, and is aligned with the locking hole of the turntable in the vertical direction when the turntable is at zero position;

[0013] The reversing mechanism is used to convert the left-right movement of the slider into the up-and-down movement of the locking rod through the pulley fixing seat and the pulley, so that the top end of the locking rod extends into the locking hole of the turntable to achieve locking when the lifting mechanism is lowered, and exits the locking hole of the turntable to achieve unlocking when the lifting mechanism is raised;

[0014] The clamping mechanism is fixedly mounted on the base, and is used to make the bottom end of the locking rod always abut against the reversing mechanism to prevent the locking rod from shaking up and down.

[0015] Furthermore, the reversing mechanism is composed of four hinges and a steel plate; the hinges are all capable of rotating about their own rotation axes; the four hinges, the steel plate and the upper cover of the lifting mechanism are connected to form a parallelogram structure, and the four hinges are respectively located at the four corners of the parallelogram structure, wherein the two upper hinges are fixedly mounted on the bottom surface of the upper cover, the two lower hinges are fixedly connected to the two ends of the steel plate, and the upper hinges and the lower hinges opposite to each other are fixedly connected;

[0016] The bottom end of the locking rod abuts against the top surface of the steel plate;

[0017] The maximum height of the reversing mechanism is less than the height of the two hinges facing each other, and the minimum height is the distance between the top of the pulley and the bottom of the upper cover plate;

[0018] When the pulley moves, the hinge on the lower side rotates counterclockwise under the push of the pulley, and the steel plate moves upward driven by the hinge, converting the horizontal movement of the slider into the vertical movement of the locking rod.

[0019] Furthermore, the guide seat is fixedly mounted on the base and is provided with a through hole extending in a vertical direction;

[0020] The locking rod passes through the through hole with a clearance fit.

[0021] Furthermore, the clamping mechanism includes a clamping seat fixedly mounted on the base and a clamping spring installed in the clamping seat;

[0022] The pressing seat is provided with a mounting hole extending in the vertical direction, and limited retaining edges are provided at both ends of the mounting hole;

[0023] The locking rod passes through the mounting hole, and a first annular flange is arranged in the mounting hole;

[0024] The compression spring is sleeved on the locking rod and is limited between the first annular flange and the limiting rib at the top of the mounting hole, and is used to apply a downward compression force to the locking rod;

[0025] The first annular flange is clearance-matched with the mounting hole.

[0026] Furthermore, the locking rod is composed of a locking rod upper section, a locking rod lower section and an elastic protection mechanism;

[0027] The elastic protection mechanism is composed of a protection spring and a protection sleeve;

[0028] The upper section of the locking rod and the lower section of the locking rod are flexibly connected via the protection spring;

[0029] The bottom end of the upper section of the locking rod, the top end of the lower section of the locking rod and the protection spring are all confined within the protection sleeve.

[0030] Furthermore, the upper section of the locking rod is provided with a second limiting flange located inside the protective sleeve;

[0031] The lower section of the locking rod is provided with a third limiting flange located in the protective sleeve;

[0032] The protection spring is connected between the second limiting flange and the third limiting flange;

[0033] The second limiting flange and the third limiting flange are clearance-matched with the inner hole of the protective sleeve, and are slidingly matched with the protective sleeve.

[0034] Furthermore, two guide seats are provided, which are respectively located at two ends of the locking rod.

[0035] Furthermore, the pressing seat and the protective sleeve are both located between the two guide seats.

[0036] Furthermore, the protective sleeve is located between the pressing seat and the upper guide seat.

[0037] Furthermore, the bottom end of the locking rod adopts a hemispherical head structure;

[0038] The lifting mechanism is a scissor-fork type lifting mechanism.

[0039] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0040] The locking device for the turntable and the lifting mechanism linkage of the present invention utilizes a locking rod to achieve locking and unlocking along with the lifting mechanism, so that the locking device and the lifting mechanism are mechanically linked, which greatly improves reliability, does not require additional electrical components, consumes little electricity, and generates little heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of the locking device of the turntable and the lifting mechanism linkage of the present invention;

[0042] Figure 2 It is a structural schematic diagram of the lifting mechanism;

[0043] Figure 3 It is a structural schematic diagram of the reversing mechanism when the locking rod is in the unlocked state;

[0044] Figure 4 It is a structural schematic diagram of the reversing mechanism when the locking rod is in a locked state;

[0045] Figure 5 It is a structural schematic diagram of the elastic protection mechanism when the locking rod is in the unlocked state;

[0046] Figure 6 It is a structural schematic diagram of the elastic protection mechanism when the locking rod is in the locked state.

[0047] Among them, 1-slider; 2-guide rail; 3-pulley fixing seat; 4-pulley; 5-reversing mechanism; 6-guide seat; 7-pressing mechanism; 8-locking rod; 9-elastic protective mechanism; 10-turntable locking hole; 11-base; 51-first hinge; 52-second hinge; 53-third hinge; 54-fourth hinge; 55-steel plate; 71-pressing spring; 81-upper section of locking rod; 82-lower section of locking rod; 91-protective spring. DETAILED DESCRIPTION

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

[0049] like Figure 1As shown in the structure, an embodiment of the present invention provides a locking device for a turntable and a lifting mechanism, the locking device comprising a lifting mechanism, a turntable, a pulley fixing seat 3, a pulley 4, a reversing mechanism 5, a guide seat 6, a clamping mechanism 7 and a locking rod 8; wherein: the turntable, the base 11 and the lifting mechanism are arranged in sequence from top to bottom along the vertical direction; the base 11 is fixedly installed on the top of the lifting mechanism; the turntable can be rotatably installed on the top of the base 11; in this embodiment, the lifting mechanism is described by taking a scissor-fork type lifting mechanism as an example, as shown in FIG. Figure 1 and Figure 2 As shown, the top of the lifting mechanism has two pairs of sliding blocks 1 and guide rails 2 that are slidably matched, which are used to achieve lifting by sliding the sliders 1 along the guide rails 2; Figure 1 As shown, the turntable is provided with a turntable locking hole 10; Figure 2 As shown, the pulley fixing seat 3 is fixedly connected to the two sliders 1 and can move synchronously with the two sliders 1 ; the pulley 4 is rotatably mounted on the pulley fixing seat 3 and is used to drive the reversing mechanism 5 .

[0050] like Figure 1 As shown, the locking rod 8 is installed on the base 11 in a vertically movable manner through the guide seat 6 and the clamping mechanism 7, and is aligned with the turntable locking hole 10 in the vertical direction when the turntable is at zero position; the guide seat 6 is used to guide the movement of the locking rod 8 so that the locking rod 8 always moves in the vertical direction; the guide seat 6 is fixedly installed on the base 11 and is provided with a through hole extending in the vertical direction; the locking rod 8 passes through the through hole with clearance fit. There are two guide seats 6, which are respectively located at the two ends of the locking rod 8, that is, the two guide seats 6 guide the top end and the bottom end of the locking rod 8 respectively.

[0051] like Figure 1 As shown, the reversing mechanism 5 is used to convert the left and right movement of the slider 1 into the up and down movement of the locking rod 8 through the pulley fixing seat 3 and the pulley 4, so that the top end of the locking rod 8 extends into the turntable locking hole 10 to achieve locking when the lifting mechanism is lowered, and exits the turntable locking hole 10 to achieve unlocking when the lifting mechanism is raised; Figure 3 and Figure 4 As shown, the reversing mechanism 5 can be composed of four hinges and a steel plate 55; the hinges can rotate on their own rotating axes; the four hinges, the steel plate 55 and the upper cover of the lifting mechanism are connected to form a parallelogram structure, which can keep the upper and lower sides always parallel during the rotation of the four hinges, and can achieve a stable lifting of the bottom side without angular deflection, which helps to push the locking rod 8 to rise steadily and is not prone to jamming; the four hinges are respectively located at the four corners of the parallelogram structure, wherein the two upper hinges are fixedly installed on the bottom surface of the upper cover, and the two lower hinges are fixedly connected to the two ends of the steel plate 55, and the upper hinges opposite to each other are fixedly connected to the lower hinges, so as to prevent the locking rod 8 from getting stuck. Figure 3For example, the four hinges are respectively the first hinge 51, the second hinge 52, the third hinge 53 and the fourth hinge 54. The two upper hinges are respectively the first hinge 51 and the second hinge 52 fixedly installed on the bottom surface of the upper cover plate, and the two lower hinges are respectively the third hinge 53 and the fourth hinge 54. The third hinge 53 is opposite to the first hinge 51 in the vertical direction and is fixedly connected to the bottom end of the first hinge 51. The fourth hinge 54 is opposite to the second hinge 52 in the vertical direction and is fixedly connected to the bottom end of the second hinge 52. The third hinge 53 is fixedly connected to the left end of the steel plate 55, and the fourth hinge 54 is fixedly connected to the right end of the steel plate 55. The third hinge 53, the fourth hinge 54 and the steel plate 55 can be connected by welding. The steel plate 55 is arranged in parallel with the upper cover plate. The bottom end of the locking rod 8 abuts against the top surface of the steel plate 55, thereby driving the locking rod 8 to move up and down in the vertical direction through the steel plate 55. Figure 3 As shown, the maximum height A of the reversing mechanism 5 is less than the height of the two hinges facing each other. Figure 4 As shown, the minimum height B is the distance between the top of the pulley 4 and the bottom surface of the upper cover plate; when the pulley 4 moves, the hinge on the lower side rotates counterclockwise under the push of the pulley 4, and the steel plate 55 moves upward under the drive of the hinge, converting the horizontal movement of the slider 1 into the vertical movement of the locking rod 8. By limiting the expansion angle of the hinge, the overall maximum height limit of the reversing mechanism 5 is set to A, and it will not continue to move downward. When the pulley 4 moves toward the reversing mechanism 5, the four hinges rotate counterclockwise under the push of the pulley 4, and the bottom edge of the reversing mechanism 5 moves upward, thus converting the horizontal movement into vertical movement, as shown in FIG. Figure 4 As shown, the height of the reversing mechanism 5 changes from the maximum height A to the minimum height B (B<A), and the rising height of the locking rod 8 is AB.

[0052] The clamping mechanism 7 is fixedly mounted on the base 11, and is used to make the bottom end of the locking rod 8 always contact the reversing mechanism 5 to prevent the locking rod 8 from shaking up and down due to bumps. Figure 1 As shown, the clamping mechanism 7 includes a clamping seat fixedly mounted on the base 11 and a clamping spring 71 installed in the clamping seat; the clamping seat is provided with a mounting hole extending in the vertical direction, and limiting retaining edges are provided at both ends of the mounting hole; the locking rod 8 passes through the mounting hole, and a first annular flange is provided in the mounting hole; the clamping spring 71 is sleeved on the locking rod 8 and is limited between the first annular flange and the limiting retaining edge at the top of the mounting hole, and is used to apply a downward clamping force to the locking rod 8; the first annular flange is clearance-matched with the mounting hole, the first annular flange contacts with the bottom end of the clamping spring 71, and the first annular flange can slide in the mounting hole in the vertical direction, so that the locking rod 8 can be guided while applying a downward clamping force to the locking rod 8 at the first annular flange through the clamping spring 71.

[0053] Considering some extreme cases, after the turntable is completed, due to machine failure, the turntable locking hole 10 and the locking rod 8 are not aligned. At this time, the locking rod 8 will hit the turntable structure. Since the lifting mechanism pushes the locking rod 8 up with a large force, it may cause damage to the locking rod 8 or the turntable structure. The elastic protection mechanism 9 is a safety protection mechanism designed for this situation. Its working principle is as follows: Figure 5 and Figure 6 As shown, the locking rod 8 is divided into an upper locking rod section 81 and a lower locking rod section 82, and the middle of the upper locking rod section 81 and the lower locking rod section 82 is flexibly connected by an elastic protective mechanism 9. During normal operation, the upper locking rod section 81 and the lower locking rod section 82 are always separated by a distance under the elastic force of the protective spring 91. When locking, if the turntable locking hole 10 is not aligned with the locking rod 8, the upper locking rod section 81 will hit the turntable structure, and the protective spring 91 will be compressed under the pushing force of the lower locking rod section 82, and the distance between the upper locking rod section 81 and the lower locking rod section 82 will become smaller, as shown in FIG. Figure 6 As shown, the force exerted by the locking rod 8 on the turntable structure is only the elastic force of the spring and will not cause mechanical damage.

[0054] In order to achieve the above protection function, the locking rod 8 adopts the following specific structure: Figure 1 , Figure 5 and Figure 6 As shown, the locking rod 8 is composed of an upper locking rod section 81, a lower locking rod section 82 and an elastic protective mechanism 9; the elastic protective mechanism 9 is composed of a protective spring 91 and a protective sleeve; the upper locking rod section 81 and the lower locking rod section 82 are flexibly connected via the protective spring 91; the bottom end of the upper locking rod section 81, the top end of the lower locking rod section 82 and the protective spring 91 are all confined within the protective sleeve; the protective sleeve is not fixed to the base 11 and can move up and down with the locking rod 8; when the locking rod 8 is unlocked or unlocked, there is a gap between the upper locking rod section 81 and the lower locking rod section 82, and the protective spring 91 is in an extended state. The upper section 81 of the locking rod is provided with a second limiting flange located inside the protective sleeve; the lower section 82 of the locking rod is provided with a third limiting flange located inside the protective sleeve; the protective spring 91 is connected between the second limiting flange and the third limiting flange; the second limiting flange and the third limiting flange are matched with the inner hole clearance of the protective sleeve, and are slidably matched with the protective sleeve.

[0055] like Figure 1 As shown, the pressing seat and the protective sleeve are both located between the two guide seats 6. The protective sleeve is located between the pressing seat and the upper guide seat 6. The bottom end of the locking rod 8 adopts a hemispherical head structure, which can reduce the friction between the locking rod 8 and the steel plate 55.

[0056] The above linkage locking device mainly utilizes the characteristic that the slider 1 will slide left and right along the guide rail 2 during the lifting process of the lifting mechanism, and changes the left and right movement of the slider 1 into up and down movement through the reversing mechanism 5, thereby driving the locking rod 8 to achieve the locking and unlocking operation of the turntable. A pulley fixing seat 3 and a pulley 4 are added to the position of the slider 1 of the lifting mechanism, so that the pulley 4 can move left and right with the slider 1.

[0057] When the turntable adopts the above-mentioned interlocking locking device, after the turntable is finished working and before the lifting mechanism is ready to descend, the turntable is controlled to return to the zero position. At this time, the turntable locking hole 10 is coaxially aligned with the locking rod 8 and is in a state where it can be inserted. Due to the structural characteristics of the scissor-fork lifting mechanism itself, when it rises, the slider 1 will move to the left along the slide rail, and move to the right when it descends. As the lifting mechanism gradually descends, the slider 1 of the lifting mechanism drives the pulley 4 to move to the right, and the pulley 4 approaches the reversing mechanism 5. The pulley 4 pushes the reversing mechanism 5 to move its bottom surface upward, driving the locking rod 8 to move upward; when the lifting mechanism descends to a certain height, the pulley 4 causes the reversing mechanism 5 and the locking rod 8 to rise to the highest position, the locking rod 8 rises to its position, and the locking rod 8 is inserted into the turntable locking hole 10 for a certain length to lock the turntable.

[0058] When the turntable needs to work, as the lifting mechanism rises, the slider 1 of the lifting mechanism drives the pulley 4 to move to the left, and the slider 1 drives the pulley 4 to gradually move away from the reversing mechanism 5. Under the action of the locking rod 8's own gravity and the clamping force of the clamping spring 71, the locking rod 8 drives the reversing mechanism 5 to move downward, and the locking rod 8 is gradually pulled out of the turntable locking hole 10. After the lifting mechanism rises to its position, the pulley 4 is out of contact with the reversing mechanism 5, and the reversing mechanism 5 is lowered to the lower limit state. The locking rod 8 is completely pulled out, and the turntable is unlocked. At this time, under the action of the clamping mechanism 7, the locking rod 8 supports the steel plate 55 of the reversing mechanism 5 in the lower limit state, and the locking rod 8 is in a stable pulled-out state. The clamping mechanism 7 can prevent the locking device from vibrating up and down due to bumps.

[0059] Considering some extreme cases, after the turntable is completed, the locking hole of the turntable is misaligned with the locking rod 8 due to a machine failure. At this time, the locking rod 8 will hit the turntable structure. Since the lifting mechanism pushes the locking rod 8 upward with a large force, it may cause damage to the locking rod 8 or the turntable structure. For this reason, an elastic protection mechanism 9 is designed, which divides the locking rod 8 into two parts, and a protective spring 91 is used to achieve a flexible connection in the middle. When the locking rod 8 is not inserted into the turntable locking hole 10, the protective spring 91 will be compressed, and the force of the locking rod 8 hitting the turntable structure is only the elastic force of the spring, which will not cause mechanical damage.

[0060] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A locking device for a turntable and a lifting mechanism, characterized in that: It includes a lifting mechanism, a turntable, a pulley fixing seat, a pulley, a reversing mechanism, a guide seat, a clamping mechanism and a locking rod; The turntable, the base and the lifting mechanism are arranged in sequence from top to bottom along the vertical direction; The top of the lifting mechanism is provided with two pairs of sliding blocks and guide rails that are slidably matched, and is used to achieve lifting by sliding the sliding blocks along the guide rails; The turntable is provided with a turntable locking hole; The pulley fixing seat is fixedly connected to the two sliding blocks; The pulley is rotatably mounted on the pulley fixing seat and is used to drive the reversing mechanism; The locking rod is mounted on the base in a vertically movable manner through the guide seat and the clamping mechanism, and is aligned with the locking hole of the turntable in the vertical direction when the turntable is at zero position; The reversing mechanism is used to convert the left-right movement of the slider into the up-and-down movement of the locking rod through the pulley fixing seat and the pulley, so that the top end of the locking rod extends into the locking hole of the turntable to achieve locking when the lifting mechanism is lowered, and exits the locking hole of the turntable to achieve unlocking when the lifting mechanism is raised; The clamping mechanism is fixedly mounted on the base, and is used to make the bottom end of the locking rod always abut against the reversing mechanism to prevent the locking rod from shaking up and down.

2. The locking device according to claim 1, characterized in that: The reversing mechanism is composed of four hinges and a steel plate; the hinges are all capable of rotating about their own rotation axes; the four hinges, the steel plate and the upper cover of the lifting mechanism are connected to form a parallelogram structure, and the four hinges are respectively located at the four corners of the parallelogram structure, wherein the two upper hinges are fixedly mounted on the bottom surface of the upper cover, the two lower hinges are fixedly connected to the two ends of the steel plate, and the upper hinges and the lower hinges opposite to each other are fixedly connected; The bottom end of the locking rod abuts against the top surface of the steel plate; The maximum height of the reversing mechanism is less than the height of the two hinges facing each other, and the minimum height is the distance between the top of the pulley and the bottom surface of the upper cover plate; When the pulley moves, the hinge on the lower side rotates counterclockwise under the push of the pulley, and the steel plate moves upward driven by the hinge, converting the horizontal movement of the slider into the vertical movement of the locking rod.

3. The locking device according to claim 2, characterized in that: The guide seat is fixedly mounted on the base and is provided with a through hole extending in a vertical direction; The locking rod passes through the through hole with a clearance fit.

4. The locking device according to claim 2, characterized in that: The clamping mechanism comprises a clamping seat fixedly mounted on the base and a clamping spring installed in the clamping seat; The pressing seat is provided with a mounting hole extending in the vertical direction, and limited retaining edges are provided at both ends of the mounting hole; The locking rod passes through the mounting hole, and a first annular flange is arranged in the mounting hole; The compression spring is sleeved on the locking rod and is limited between the first annular flange and the limiting rib at the top of the mounting hole, and is used to apply a downward compression force to the locking rod; The first annular flange is clearance-matched with the mounting hole.

5. The locking device according to claim 4, characterized in that: The locking rod is composed of a locking rod upper section, a locking rod lower section and an elastic protection mechanism; The elastic protection mechanism is composed of a protection spring and a protection sleeve; The upper section of the locking rod and the lower section of the locking rod are flexibly connected via the protection spring; The bottom end of the upper section of the locking rod, the top end of the lower section of the locking rod and the protection spring are all confined within the protection sleeve.

6. The locking device according to claim 5, characterized in that: The upper section of the locking rod is provided with a second limiting flange located in the protective sleeve; The lower section of the locking rod is provided with a third limiting flange located in the protective sleeve; The protection spring is connected between the second limiting flange and the third limiting flange; The second limiting flange and the third limiting flange are clearance-matched with the inner hole of the protective sleeve, and are slidingly matched with the protective sleeve.

7. The locking device according to claim 5, characterized in that: The guide seats are provided with two, which are respectively located at the two ends of the locking rod.

8. The locking device according to claim 7, characterized in that: The pressing seat and the protective sleeve are both located between the two guide seats.

9. The locking device according to claim 8, characterized in that: The protective sleeve is located between the pressing seat and the upper guide seat.

10. The locking device according to any one of claims 1 to 9, characterized in that: The bottom end of the locking rod adopts a hemispherical head structure; The lifting mechanism is a scissor-fork type lifting mechanism.

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