A turntable and lifting mechanism linkage locking device

Abstract

The application discloses a linkage locking device of a rotary table and a lifting mechanism, which has a sliding block and a guide rail on the top of the lifting mechanism; the rotary table is provided with a rotary table locking hole; a pulley fixing seat is fixedly connected with two sliding blocks; a pulley is rotatably installed on the pulley fixing seat; a locking rod is movably installed on a base in the vertical direction through a guide seat and a pressing mechanism, and is aligned with the rotary table locking hole in the vertical direction when the rotary table is in the zero position; a reversing mechanism is used for converting the left-right movement of the sliding block into the up-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 rotary table locking hole to realize locking when the lifting mechanism is lowered, and the top end of the locking rod exits the rotary table locking hole to realize unlocking when the lifting mechanism is raised; the pressing mechanism is fixedly installed on the base and is used for making the bottom end of the locking rod always abut against the reversing mechanism to avoid the up-down shaking of the locking rod. The above-mentioned locking device does not need to increase electrical components and does not consume electricity, and has high reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of locking, in particular to a linkage locking device of a rotary table and a lifting mechanism. BACKGROUND

[0002] At present, in the military industry, many photoelectric rotary tables are used together with lifting mechanisms. In the non-working state, the lifting mechanism is lowered to the lowest position, driving the rotary table to be lowered into the vehicle cabin, which plays a role in protecting the rotary table and reducing the overall height of the vehicle, so that the equipment vehicle can pass through the culvert, tunnel and other height-limited areas. When the rotary table needs to work, the lifting mechanism drives the rotary table to rise to the highest point, and the rotary table is exposed to a certain height above the roof, so that the rotary table can work normally.

[0003] When the rotary table is in the vehicle cabin, the rotary table azimuth shaft system needs to be locked to prevent the rotary table from shaking and colliding with the vehicle cabin. The commonly used method is to use an electromagnet as a locking device. After the lifting mechanism is lowered to the position, the electromagnet is de-energized, and the locking pin of the electromagnet is inserted into the rotary table shaft system locking hole under the action of the spring restoring force to lock the rotary table shaft system. After the lifting mechanism is raised to the position, the electromagnet is energized, and the locking pin is pulled out under the action of the electromagnetic force to restore the rotary table shaft system to rotate. However, the existing locking method has many shortcomings: first, the electromagnet needs to be powered on all the time when the rotary table is working, and the heat generated by the electromagnet in the working state is very large, often reaching more than 60℃, which brings a great burden to the equipment cooling system and power supply system; second, the reliability is not high, and when the program or power supply sequence is wrong, the electromagnet may be accidentally opened or locked, causing equipment failure. SUMMARY

[0004] In order to overcome the shortcomings of low reliability and large heat generation of the existing locking mechanism, the present application provides a linkage locking device of a rotary table and a lifting mechanism. The locking device is linked with the lifting mechanism, and the left-right movement of the sliding block is converted into the up-down movement of the locking rod. No additional electrical components are needed, and no power is consumed. When the lifting mechanism is raised, the locking rod is pulled out under the action of mechanical linkage to unlock the rotary table. When the lifting mechanism is lowered, the locking rod is inserted into the rotary table locking hole of the rotary table under the action of mechanical linkage to lock the rotary table, which has high reliability.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following specific technical scheme:

[0006] A linkage locking device of a rotary table and a lifting mechanism, the linkage locking device comprising a lifting mechanism, a rotary table, a pulley fixing seat, a pulley, a reversing mechanism, a guide seat, a pressing mechanism and a locking rod;

[0007] The rotary table, the base and the lifting mechanism are sequentially arranged in the vertical direction from top to bottom;

[0008] The top of the lifting mechanism has two pairs of slidingly fitted sliders and guide rails, for lifting by sliding of the sliders along the guide rails;

[0009] The rotary table is provided with a rotary table locking hole;

[0010] The pulley fixing seat is fixedly connected with the two sliders;

[0011] The pulley is rotatably installed on the pulley fixing seat, for driving the reversing mechanism;

[0012] The locking rod is movably installed on the base along the vertical direction through the guide seat and the pressing mechanism, and is aligned with the rotary table locking hole along the vertical direction when the rotary table is in zero position;

[0013] The reversing mechanism is used for converting the left-right movement of the sliders into the up-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 rotary table locking hole to realize locking when the lifting mechanism is lowered, and the top end of the locking rod exits the rotary table locking hole to realize unlocking when the lifting mechanism is raised;

[0014] The pressing mechanism is fixedly installed on the base, for making the bottom end of the locking rod always abut against the reversing mechanism to avoid the up-down shaking of the locking rod.

[0015] Further, the reversing mechanism is composed of four hinges and a steel plate; the hinges can rotate around their own rotation axes; the four hinges, the steel plate and the upper cover plate 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 upper two hinges are fixedly installed on the bottom surface of the upper cover plate, the lower two hinges are fixedly connected to the two ends of the steel plate, and the upper and lower opposite hinges 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 upper and lower opposite hinges, and the minimum height is the distance between the top end of the pulley and the bottom surface of the upper cover plate;

[0018] When the pulley moves, the lower hinge rotates counterclockwise under the pushing of the pulley, and the steel plate moves upward under the driving of the hinge, converting the horizontal movement of the slider into the vertical movement of the locking rod.

[0019] Further, the guide seat is fixedly installed on the base and is provided with a through hole extending along the vertical direction;

[0020] The locking rod is gap-fitted through the through hole.

[0021] Further, the pressing mechanism comprises a pressing base fixedly installed on the base and a pressing spring installed in the pressing base;

[0022] The pressing base is provided with a mounting hole extending in the vertical direction, and a limiting stopper is arranged at both ends of the mounting hole;

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

[0024] The pressing spring is sleeved on the locking rod and is limited between the first annular flange and the limiting stopper at the top of the mounting hole, for applying a downward pressing force to the locking rod;

[0025] The first annular flange and the mounting hole are in clearance fit.

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

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

[0028] The upper locking rod segment and the lower locking rod segment are flexibly connected through the protection spring;

[0029] The bottom end of the upper locking rod segment, the top end of the lower locking rod segment, and the protection spring are all limited in the protection sleeve.

[0030] Further, the upper locking rod segment is provided with a second limiting flange located in the protection sleeve;

[0031] The lower locking rod segment is provided with a third limiting flange located in the protection 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 in clearance fit with the inner hole of the protection sleeve and in sliding fit with the protection sleeve.

[0034] Further, the guide base is provided with two, respectively located at both ends of the locking rod.

[0035] Further, the pressing base and the protection sleeve are both located between the two guide bases.

[0036] Further, the protection sleeve is located between the pressing base and the upper guide base.

[0037] Further, 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 scheme of the present application has the following beneficial effects:

[0040] The turntable and lifting mechanism linkage locking device of the present application utilizes the locking rod to realize locking and unlocking with the lifting of the lifting mechanism, so that the locking device and the lifting mechanism are mechanically linked, greatly improving the reliability, without the need to increase electrical components, without power consumption, and with small heat generation. BRIEF DESCRIPTION OF DRAWINGS

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

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

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

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

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

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

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

[0048] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0049] As Figure 1As shown in the structure, the embodiment of the present application provides a linkage locking device of a rotary table and a lifting mechanism, which comprises a lifting mechanism, a rotary table, a pulley fixing seat 3, a pulley 4, a reversing mechanism 5, a guide seat 6, a pressing mechanism 7 and a locking rod 8; wherein: the rotary table, a base 11 and the lifting mechanism are sequentially arranged from top to bottom along the vertical direction; the base 11 is fixedly installed on the top of the lifting mechanism; the rotary table is rotatably installed on the top of the base 11; in this embodiment, the lifting mechanism is taken as an example to illustrate a scissor fork type lifting mechanism, as shown in Figure 1 and Figure 2 As shown, the top of the lifting mechanism has two pairs of slidingly matched sliding blocks 1 and guide rails 2, which are used to realize lifting by sliding the sliding blocks 1 along the guide rails 2; as shown in Figure 1 As shown, the rotary table is provided with a rotary table locking hole 10; as shown in Figure 2 The pulley fixing seat 3 is fixedly connected with the two sliding blocks 1 and can move synchronously with the two sliding blocks 1; the pulley 4 is rotatably installed on the pulley fixing seat 3 and is used to drive the reversing mechanism 5.

[0050] As shown in Figure 1 The locking rod 8 is movably installed on the base 11 along the vertical direction through the guide seat 6 and the pressing mechanism 7 and is aligned with the rotary table locking hole 10 along the vertical direction when the rotary table 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 along the vertical direction; the guide seat 6 is fixedly installed on the base 11 and is provided with a through hole extending along the vertical direction; the locking rod 8 is gap-fitted through the through hole. The guide seat 6 is provided with two, respectively at both 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] As shown in Figure 1 The reversing mechanism 5 is used to convert the left-right movement of the sliding block 1 into the up-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 rotary table locking hole 10 to realize locking when the lifting mechanism is lowered, and exits the rotary table locking hole 10 to realize unlocking when the lifting mechanism is raised; as shown in Figure 3 and Figure 4 The reversing mechanism 5 can be composed of four hinges and a steel plate 55; the hinges can rotate around their own rotation axes; the four hinges, the steel plate 55 and the upper cover plate 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, can realize the stable lifting of the bottom side without angle deflection, is helpful to promote the stable rising of the locking rod 8 and is not easy to be stuck; the four hinges are respectively located at the four corners of the parallelogram structure, wherein the upper two hinges are fixedly installed on the bottom surface of the upper cover plate, the lower two hinges are fixedly connected to the two ends of the steel plate 55, the upper and lower opposite upper and lower hinges are fixedly connected, so that Figure 3For example, the four hinges are respectively a first hinge 51, a second hinge 52, a third hinge 53 and a fourth hinge 54, the upper two hinges are respectively the first hinge 51 and the second hinge 52 which are fixedly installed on the bottom surface of the upper cover plate, the lower two 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, the fourth hinge 54 is fixedly connected to the right end of the steel plate 55, and 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, so as to drive the locking rod 8 to move up and down in the vertical direction through the steel plate 55; as shown in Figure 3 , the maximum height A of the reversing mechanism 5 is less than the height of the two opposite hinges, as shown in Figure 4 , the minimum height B is the distance between the top end of the pulley 4 and the bottom surface of the upper cover plate; when the pulley 4 moves, the lower hinge rotates counterclockwise under the pushing of the pulley 4, and the steel plate 55 moves upward under the driving of the hinge, converting the horizontal movement of the sliding block 1 into the vertical movement of the locking rod 8. Through the limiting design of the unfolding angle of the hinge, the overall maximum height limit of the reversing mechanism 5 is A, which cannot continue to move downward. When the pulley 4 moves towards the reversing mechanism 5, the four hinges rotate counterclockwise under the pushing of the pulley 4, and the bottom edge of the reversing mechanism 5 moves upward, thus converting the horizontal movement into the vertical movement, as shown in Figure 4 , the height of the reversing mechanism 5 changes from the maximum height A to the minimum height B (B

[0052] The pressing mechanism 7 is fixedly installed on the base 11 and is used for abutting the bottom end of the locking rod 8 against the reversing mechanism 5 at all times to avoid the locking rod 8 from shaking up and down due to bumps. As shown in Figure 1 , the pressing mechanism 7 comprises a pressing seat fixedly installed on the base 11 and a pressing spring 71 installed in the pressing seat; the pressing seat is provided with a mounting hole extending in the vertical direction and is provided with a limiting stop edge at both ends of the mounting hole; the locking rod 8 passes through the mounting hole and is provided with a first annular flange in the mounting hole; the pressing spring 71 is sleeved on the locking rod 8 and is limited between the first annular flange and the limiting stop edge at the top of the mounting hole, and is used for applying a downward pressing force to the locking rod 8; the first annular flange is in clearance fit with the mounting hole, the first annular flange is in contact with the bottom end of the pressing spring 71, and the first annular flange can slide in the vertical direction in the mounting hole, so as to guide the locking rod 8 and apply the downward pressing force to the locking rod 8 at the first annular flange through the pressing spring 71.

[0053] In view of some extreme cases, after the turret work is completed, the turret locking hole 10 and the locking rod 8 are not aligned due to machine failure, at this time the locking rod 8 will be pushed to the turret structure, because the lifting mechanism pushes the locking rod 8 to rise with great force, it may cause damage to the locking rod 8 or the turret structure. The elastic protection mechanism 9 is a safety protection mechanism designed for this situation, and its working principle is shown in Figure 5 and Figure 6 , which divides the locking rod 8 into two parts, the upper locking rod 81 and the lower locking rod 82, and the middle of the upper locking rod 81 and the lower locking rod 82 is flexibly connected through the elastic protection mechanism 9. In normal work, the upper locking rod 81 and the lower locking rod 82 are always separated by a distance under the elastic force of the protection spring 91. When locking, if the turret locking hole 10 and the locking rod 8 are not aligned, the upper locking rod 81 will be pushed to the turret structure, and the protection spring 91 will be compressed under the pushing force of the lower locking rod 82, and the distance between the upper locking rod 81 and the lower locking rod 82 will be reduced, as shown in Figure 6 , the force of the locking rod 8 pushed to the turret structure is only the size of the spring force, which will not cause mechanical damage.

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

[0055] As shown in Figure 1 , the pressing seat and the protection sleeve are located between the two guide seats 6. The protection 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 linkage locking device mainly utilizes the characteristic that the slider 1 slides left and right along the guide rail 2 during the lifting process of the lifting mechanism, changes the left and right movement of the slider 1 to up and down movement through the reversing mechanism 5, and further drives the locking rod 8 to realize the locking and unlocking operation of the rotary table. The pulley fixing seat 3 and the pulley 4 are installed at the position of the slider 1 of the lifting mechanism, so that the pulley 4 can move left and right together with the slider 1.

[0057] When the rotary table adopts the linkage locking device, after the rotary table is finished working, before the lifting mechanism is ready to descend, the rotary table is controlled to return to the zero position, at this time, the rotary table locking hole 10 is coaxially aligned with the locking rod 8 and is in an insertable state. Due to the structural characteristics of the scissor fork lifting mechanism, when it rises, the slider 1 moves left along the slide rail, and when it descends, it moves right. As the lifting mechanism gradually descends, the slider 1 of the lifting mechanism drives the pulley 4 to move right, the pulley 4 approaches the reversing mechanism 5, the pulley 4 drives the reversing mechanism 5 to move upward, and the locking rod 8 moves upward; when the lifting mechanism descends to a certain height, the pulley 4 makes the reversing mechanism 5 and the locking rod 8 rise to the highest position, the locking rod 8 rises to the position, the locking rod 8 is inserted into the rotary table locking hole 10 by a certain length, and the rotary table is locked.

[0058] When the rotary table needs to work, as the lifting mechanism rises, the slider 1 of the lifting mechanism drives the pulley 4 to move left, the slider 1 drives the pulley 4 to gradually move away from the reversing mechanism 5, under the action of the gravity of the locking rod 8 and the compression force of the compression spring 71, the locking rod 8 drives the reversing mechanism 5 to move downward, the locking rod 8 gradually pulls out of the rotary table locking hole 10, after the lifting mechanism rises to the position, the pulley 4 is out of contact with the reversing mechanism 5, the reversing mechanism 5 is lowered to the lower limit state, the locking rod 8 is completely pulled out, and the unlocking of the rotary table is completed. At this time, under the action of the compression mechanism 7, the locking rod 8 presses against the steel plate 55 of the reversing mechanism 5 in the lower limit state, the locking rod 8 is in a stable pulled-out state, and the compression mechanism 7 can prevent the locking device from vibrating up and down due to bumps.

[0059] Considering some extreme cases, after the rotary table is finished working, due to machine failure, the locking hole of the rotary table is not aligned with the locking rod 8, at this time, the locking rod 8 will top the rotary table structure, because the lifting mechanism pushes the locking rod 8 to rise with great force, it may cause damage to the locking rod 8 or the rotary table structure. Therefore, an elastic protection mechanism 9 is designed, which divides the locking rod 8 into two parts and realizes flexible connection through the protection spring 91 in the middle. When the locking rod 8 is not inserted into the rotary table locking hole 10, the protection spring 91 will be compressed, and the force of the locking rod 8 pressing against the rotary table structure is only the size of the spring force, which will not cause mechanical damage.

[0060] It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present application without departing from the spirit and scope of the application. Thus, it is intended that the present application cover the modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

Claims

1. A locking device for linkage between a turntable and a lifting mechanism, characterized in that, It includes a lifting mechanism, a turntable, a pulley fixing seat, pulleys, a reversing mechanism, a guide seat, a clamping mechanism, and a locking rod; The turntable, the base, and the lifting mechanism are arranged vertically from top to bottom. The top of the lifting mechanism has two pairs of slidingly engaged sliders and guide rails, which are used to achieve lifting by sliding the sliders along the guide rails; The turntable is provided with a turntable locking hole; The pulley fixing seat is fixedly connected to the two sliders; The pulley is rotatably mounted on the pulley fixing seat and is used to drive the reversing mechanism; The locking rod is vertically movable on the base via the guide seat and the pressing mechanism, and is aligned vertically with the locking hole of the turntable when the turntable is in the zero position. The reversing mechanism is used to convert the left and 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 turntable locking hole to lock when the lifting mechanism is lowered, and exits the turntable locking hole to unlock when the lifting mechanism is raised. The clamping mechanism is fixedly installed on the base to ensure that the bottom end of the locking rod is always in contact with the reversing mechanism to prevent the locking rod from wobbling up and down.

2. The locking device as described in claim 1, characterized in that, The reversing mechanism consists of four hinges and a steel plate; each hinge can rotate on its own axis; the four hinges, the steel plate, and the upper cover plate of the lifting mechanism are connected to form a parallelogram structure, with the four hinges 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 plate, the two lower hinges are fixedly connected to both ends of the steel plate, and the upper and lower hinges that are opposite 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 upper and lower opposite hinges, 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 lower hinge rotates counterclockwise under the pulley's push, and the steel plate moves upward under the hinge's drive, converting the horizontal movement of the slider into the vertical movement of the locking rod.

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

4. The locking device as described in claim 2, characterized in that, The clamping mechanism includes a clamping seat fixedly installed on the base and a clamping spring installed inside the clamping seat; The clamping seat is provided with a mounting hole extending in a vertical direction, and limit stops are provided at both ends of the mounting hole; The locking rod passes through the mounting hole and is provided with a first annular flange inside the mounting hole; The compression spring is sleeved on the locking rod and is limited between the first annular flange and the limiting stop 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-fitted with the mounting hole.

5. The locking device as described in claim 4, characterized in that, The locking rod consists of an upper section, a lower section, and an elastic protective mechanism. The elastic protective mechanism consists of a protective spring and a protective sleeve; The upper section and the lower section of the locking rod are flexibly connected by the protective 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 protective spring are all confined within the protective sleeve.

6. The locking device as described in claim 5, characterized in that, The upper section of the locking rod is provided with a second limiting flange located inside the protective sleeve; The lower section of the locking rod is provided with a third limiting flange located inside the protective sleeve; The protective spring is connected between the second limiting flange and the third limiting flange; The second limiting flange and the third limiting flange are clearance-fitted with the inner hole of the protective sleeve and slide-fitted with the protective sleeve.

7. The locking device as described in claim 5, characterized in that, There are two guide seats, located at both ends of the locking rod.

8. The locking device as described in claim 7, characterized in that, Both the clamping seat and the protective sleeve are located between the two guide seats.

9. The locking device as described in claim 8, characterized in that, The protective sleeve is located between the clamping seat and the upper guide seat.

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

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