Convenient trolley

Abstract

The utility model discloses a convenient trolley, and relates to the technical field of small trolleys. Comprising two wheels, a vehicle frame is arranged between the two wheels, a supporting plate is arranged at the top of the vehicle frame, and the two ends of the supporting plate are fixedly connected to the vehicle frame of the wheels on the two sides; a strip-shaped groove is formed in the supporting frame, the supporting frame is fixedly connected to the top of the supporting plate, the guide rod is slidably connected with the strip-shaped groove, the push rod is fixedly connected to one end of the guide rod, the two clamping jaws are symmetrically arranged above the supporting plate relative to the supporting frame, and a connecting rod is hinged to the end, close to the push rod, of each clamping jaw. The two connecting rods are hinged to the two ends of the push rod respectively, a rotating shaft is further inserted into the clamping jaw, the bottom end of the rotating shaft is fixedly connected with the supporting plate, and the clamping rods and the rotating shaft rotate mutually or slide in the axial direction of the rotating shaft. The rack is fixedly connected to the bottom of the supporting plate, and a through groove corresponding to the rack is formed in the supporting plate; the elastic braking mechanism is arranged between the rack and the push rod, and the frame is connected with a handle.

Description

Technical Field

[0001] The utility model relates to the technical field of small carts, in particular to a convenient cart. Background Art

[0002] With the continuous development of logistics, warehousing and daily life, trolleys are widely used as a convenient means of carrying objects. However, existing trolleys have certain limitations when loading and fixing objects of irregular shapes or objects that are prone to rolling and sliding. They usually need to be manually fixed or tied, which is cumbersome and inefficient. At the same time, during transportation, objects are prone to loosening or even falling due to bumps or sudden stops, posing a safety hazard.

[0003] Most of the trolleys on the market currently use a flat loading plate design, which cannot effectively adapt and fix according to the actual shape of the object. Especially when carrying large, heavy or special-shaped objects, it is not only labor-intensive but also has poor stability. In addition, the existing trolleys lack intelligent and automated loading and unloading functions and cannot meet the needs of modern efficient and safe operations. Utility Model Content

[0004] To this end, an embodiment of the utility model provides a convenient trolley to solve the problems existing in the above-mentioned technology.

[0005] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0006] A convenient trolley, comprising:

[0007] Wheels, wherein two wheels are provided and the two wheels are arranged side by side, a frame is provided between the two wheels, and the wheels are rotatably connected to the frame;

[0008] A support plate, the support plate is arranged on the top of the frame, and the two ends of the support plate are fixedly connected to the frames of the wheels on both sides;

[0009] A support frame, wherein a strip groove is provided on the support frame, the support frame is fixedly connected to the top of the support plate, and the strip groove is opened in the direction along the forward direction of the trolley;

[0010] A guide rod, the guide rod is arranged in the strip groove, and the guide rod is slidably connected to the strip groove, and the sliding direction is the horizontal direction and the vertical direction opened along the strip groove;

[0011] A push rod, which is fixedly connected to one end of the guide rod and serves as the front end of the cart;

[0012] A clamping jaw, wherein two clamping jaws are provided, and the two clamping jaws are symmetrically arranged above the support plate with respect to the support frame, and a connecting rod is hingedly connected to one end of the clamping jaw close to the push rod, and the two connecting rods are respectively hinged to the two ends of the push rod, and a rotating shaft is also inserted into the clamping jaw, and the bottom end of the rotating shaft is fixedly connected to the support plate, and the clamping rod and the rotating shaft rotate relative to each other or slide along the axial direction of the rotating shaft;

[0013] A rack, the rack is fixedly connected to the bottom of the support plate, and the position of the rack corresponds to the push rod, and a through groove corresponding to the rack is opened on the support plate;

[0014] An elastic braking mechanism, which is arranged between the rack and the push rod and is used to brake the forward and backward movement of the push rod when the push rod is subjected to downward pressure;

[0015] A handle is connected to the frame and is used to push the vehicle body to move.

[0016] Optionally, the elastic braking mechanism includes a first sleeve, the first sleeve is fixedly connected to the bottom of the push rod, a second sleeve is inserted into the first sleeve, the second sleeve is slidably connected to the first sleeve, a first spring is arranged in the first sleeve, one end of the first spring is fixedly connected to the first sleeve, and the other end of the first spring is fixedly connected to the second sleeve;

[0017] A gear is provided at the bottom of the second sleeve, the gear is rotatably connected to the second sleeve, and the gear passes through the through groove and engages with the rack. A bracket is fixedly connected to the bottom of the first sleeve, the bracket is provided on one side of the gear, and a tooth block adapted to the gear is provided at the bottom of the bracket.

[0018] Optionally, a U-shaped frame is fixedly connected to the bottom of the first sleeve, and the U-shaped frame includes a horizontal portion and two vertical portions. The horizontal portion of the U-shaped frame is fixedly connected to the bottom of the first sleeve, and the horizontal portion of the U-shaped frame is sleeved on the second sleeve and the two are slidably connected. The two vertical portions of the U-shaped frame are placed on both sides of the gear rotation direction, and the tooth block is fixedly connected to the bottom of the vertical portion of the U-shaped frame.

[0019] Optionally, the support plate is fixedly connected to the frame via a lifting mechanism, the lifting mechanism comprising two groups of fourth sleeves, the two groups of fourth sleeves are respectively fixedly connected to the top of the frame corresponding to the wheel, a third sleeve is sleeved on the fourth sleeve and slidably connected, both sides of the support plate are respectively fixedly connected to the bottom of the two third sleeves, a reinforcement rod is fixedly connected between the two third sleeves, a hydraulic rod is arranged in the fourth sleeve, and the hydraulic rod is used to drive the third sleeve to slide along the fourth sleeve.

[0020] Optionally, the shape of the clamping jaw is adapted to the shape of the object to be clamped.

[0021] Optionally, the clamping jaw is arc-shaped or L-shaped.

[0022] Optionally, the push rod is an arc-shaped structure.

[0023] Optionally, the handle is arranged at an angle of 45°-60° with respect to a horizontal plane of the frame, and two handles are provided.

[0024] Optionally, auxiliary wheels are further included, wherein the auxiliary wheels are arranged between the two handles, and the auxiliary wheels are connected to the frame via a lifting assembly.

[0025] Optionally, the lifting assembly includes a fixed seat, the fixed seat is fixedly connected to the frame between the two wheels, the fixed seat includes a cylindrical support, one end of the cylindrical support has a support plate extending along its axial direction, two clamping plates perpendicular to the support plate are symmetrically arranged on the support plate about the axis of the cylindrical support, the gap between the two clamping plates is adapted to the inner diameter of the support, and a gap is arranged between the two clamping plates on the support plate and the support;

[0026] The auxiliary wheel is connected to a fifth sleeve, the auxiliary wheel is rotatably connected to the fifth sleeve, a sixth sleeve is inserted into the fifth sleeve, and a hydraulic rod is arranged in the fifth sleeve for driving the sixth sleeve to slide in the fifth sleeve;

[0027] An end of the sixth sleeve away from the fifth sleeve is fixedly connected to a hinge shaft, and the hinge shaft is inserted into the support;

[0028] The gap between the clamping plate and the support is adapted to the size of the sixth sleeve. When the hinge shaft is fully inserted into the support, the sixth sleeve corresponds to the gap between the support and the clamping plate. The sixth sleeve rotates in the support through the hinge shaft until the sixth sleeve contacts the support plate. A strong magnetic adsorption component is provided at the position where the sixth sleeve contacts the support plate. The support plate is made of metal material and is adsorbed by the strong magnetic adsorption component of the sixth sleeve.

[0029] The sixth sleeve slides in the support through the hinge shaft until the hinge shaft is partially placed between the clamps. The height of the clamps is slightly higher than the diameter of the hinge shaft and is fitted with the side wall of the sixth sleeve to limit the sixth sleeve so that it no longer rotates through the hinge shaft.

[0030] The utility model has at least the following beneficial effects:

[0031] The utility model has a support plate arranged on it, and a hinged structure for clamping claw linkage is arranged on the support plate. In the process of pushing the push rod and the guide rod, the connecting rod is driven to rotate, so that the connecting rod drives the clamping claw to rotate around the rotating shaft and approach each other to clamp the object. After the clamping is completed, the front of the vehicle is lifted, and the gravity of the object applies pressure to the clamping claw, so that the clamping claw presses the elastic braking mechanism, so that the push rod and the guide rod are stuck and no longer move forward and backward, so that the clamping claw is stuck to fix the object, which is convenient for clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly explain the prior art and the present invention, the following briefly introduces the drawings required for describing the prior art and the present invention. Obviously, the drawings described below are only exemplary, and for ordinary technicians in this field, other drawings can be derived from the provided drawings without creative work.

[0033] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0034] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model from a first viewing angle;

[0035] Figure 2 This is a structural schematic diagram of an embodiment of the utility model from a second viewing angle (a state where the push rod is forced downward and braked);

[0036] Figure 3 for Figure 1 The enlarged structural diagram of part A in the middle;

[0037] Figure 4 This is a schematic structural diagram of an embodiment of the utility model from a third viewing angle (auxiliary wheels retracted state);

[0038] Figure 5 This is a schematic structural diagram of a fourth viewing angle of an embodiment of the utility model.

[0039] Description of reference numerals:

[0040] 1. Wheel; 2. Frame; 3. Support plate; 4. Support frame; 5. Strip groove; 6. Push rod; 7. Clamp; 8. Connecting rod; 9. Rotating shaft; 10. Rack; 11. Through groove; 12. Elastic braking mechanism; 121. First sleeve; 122. Second sleeve; 123. Gear; 124. U-shaped frame; 125. Gear block; 13. Handle; 14. Lifting mechanism; 141. Third sleeve; 142. Fourth sleeve; 143. Reinforcement rod; 15. Auxiliary wheel; 16. Lifting assembly; 17. Fixed seat; 171. Support seat; 172. Support plate; 173. Clamp; 174. Fifth sleeve; 175. Sixth sleeve; 176. Articulated shaft; 18. Second spring; 19. Limit plate. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] In the description of the present invention, unless otherwise specified, "plurality" means two or more. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are intended to distinguish the objects referred to. For schemes with a sequential flow, this terminology does not have to be understood as describing a specific order or sequence. For schemes with device structures, this terminology does not distinguish between importance, positional relationships, etc.

[0043] In addition, the terms "comprises", "has" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that have been explicitly listed, but may also include other steps or units that are not explicitly listed but are inherent to these processes, methods, products or apparatuses, or steps or units that are added based on further optimization schemes conceived by the present invention.

[0044] like Figure 1 and Figure 2 As shown, a convenient trolley disclosed in the utility model includes:

[0045] Wheels 1, two wheels 1 are provided, and the two wheels 1 are arranged side by side, a frame 2 is provided between the two wheels 1, and the wheels 1 are rotatably connected to the frame 2; the frame 2 includes a cylindrical sleeve shaft, which is sleeved on the axle between the wheels 1, and also includes two U-shaped wheel 1 baffles, which are respectively fixed (inverted) at both ends of the sleeve shaft.

[0046] The support plate 3 is arranged on the top of the frame 2, and the two ends of the support plate 3 are fixedly connected to the frame 2 of the wheels 1 on both sides; the support plate 3 is installed on the baffle of the wheel 1, and the support plate 3 is a square plate, and can also be other shapes;

[0047] The support frame 4 is provided with a strip groove 5, the support frame 4 is fixedly connected to the top of the support plate 3, and the strip groove 5 is opened along the forward direction of the trolley; the support frame 4 is a rectangular long strip plate fixed on the support plate 3.

[0048] A guide rod is disposed in the strip groove 5 and is slidably connected to the strip groove 5, and the sliding direction is the horizontal direction and the vertical direction along the strip groove 5;

[0049] A push rod 6, which is fixedly connected to one end of the guide rod and serves as the front end of the cart;

[0050] The clamping jaw 7 is provided with two clamping jaws 7, which are symmetrically arranged above the support plate 3 with respect to the support frame 4. A connecting rod 8 is hinged at one end of the clamping jaw 7 close to the push rod 6. The two connecting rods 8 are respectively hinged at the two ends of the push rod 6. A rotating shaft 9 is also inserted into the clamping jaw. The bottom end of the rotating shaft 9 is fixedly connected to the support plate 3. The clamping rod and the rotating shaft 9 rotate relative to each other or slide axially along the rotating shaft 9.

[0051] The rack 10 is fixedly connected to the bottom of the support plate 3, and the position of the rack 10 corresponds to the push rod 6. The support plate 3 is provided with a through groove 11 corresponding to the rack 10;

[0052] An elastic brake mechanism 12, which is disposed between the rack 10 and the push rod 6, and is used to brake the forward and backward movement of the push rod 6 when the push rod 6 is subjected to downward pressure;

[0053] The handle 13 is connected to the frame 2 and is used to push the vehicle body to move.

[0054] Furthermore, the guide rod slides in the strip groove of the support frame 4 specifically as follows: two guide grooves are opened along the axial direction at the positions where the two sides of the guide rod contact the support frame 4, a slider that can slide along the guide groove is arranged in the guide groove, and then another guide groove is opened in the vertical direction in the strip groove 5, the slider extends out of the guide groove on the guide rod, and the extended part is placed in the guide groove in the strip groove 5, so that the guide rod can slide back and forth, and can also slide in the vertical direction in the strip groove 5.

[0055] Furthermore, in order to facilitate the return of the guide rod during unloading, a second spring 18 is sleeved on the guide rod, one end of the second spring 18 is fixed on the push rod 6, and the other end of the second spring 18 is fixed on the support frame 4. The second spring 18 is compressed during the movement of the guide rod toward the rear of the vehicle; during unloading, under the action of the restoring force of the second spring 18, the guide rod and the push rod 6 are driven to return to their original positions, so that the clamping claw 7 releases the object.

[0056] The elastic brake mechanism 12 includes a first sleeve 121, the first sleeve 121 is fixedly connected to the bottom of the push rod 6, a second sleeve 122 is inserted into the first sleeve 121, the second sleeve 122 is slidably connected to the first sleeve 121, a first spring is arranged in the first sleeve 121, one end of the first spring is fixedly connected to the first sleeve 121, and the other end of the first spring is fixedly connected to the second sleeve 122;

[0057] A gear 123 is provided at the bottom of the second sleeve 122, and the gear 123 is rotatably connected to the second sleeve 122, and the gear 123 passes through the through groove 11 and engages with the rack 10. A bracket is fixedly connected to the bottom of the first sleeve 121, and the bracket is provided on one side of the gear 123, and a tooth block 125 adapted to the gear 123 is provided at the bottom of the bracket.

[0058] A U-shaped frame 124 is fixedly connected to the bottom of the first sleeve 121. The U-shaped frame 124 includes a horizontal portion and two vertical portions. The horizontal portion of the U-shaped frame 124 is fixedly connected to the bottom of the first sleeve 121. The horizontal portion of the U-shaped frame 124 is sleeved on the second sleeve 122 and the two are slidably connected. The two vertical portions of the U-shaped frame 124 are placed on both sides of the rotation direction of the gear 123, and the gear block 125 is fixedly connected to the bottom of the vertical portion of the U-shaped frame 124.

[0059] The support plate 3 is fixedly connected to the frame 2 via a lifting mechanism 14, which includes two groups of fourth sleeves 142, which are respectively fixedly connected to the top of the frame 2 corresponding to the wheel 1, and a third sleeve 141 is sleeved and slidably connected on the fourth sleeve 142. Both sides of the support plate 3 are respectively fixedly connected to the bottom of the two third sleeves 141, and a reinforcement rod 143 is fixedly connected between the two third sleeves 141. A hydraulic rod is arranged in the fourth sleeve 142, and the hydraulic rod is used to drive the third sleeve 141 to slide along the fourth sleeve 142.

[0060] The shape of the clamping jaws 7 is adapted to the shape of the object to be clamped.

[0061] The clamping jaw 7 is arc-shaped or L-shaped.

[0062] The push rod 6 is an arc-shaped structure.

[0063] The handle 13 is arranged at an angle of 45°-60° with respect to the horizontal plane of the frame 2 , and two handles 13 are provided.

[0064] The bicycle also includes an auxiliary wheel 15 , which is disposed between the two handles 13 , and the auxiliary wheel 15 is connected to the bicycle frame 2 via a lifting assembly 16 .

[0065] The lifting assembly 16 includes a fixed seat 17, which is fixedly connected to the frame 2 between the two wheels 1. The fixed seat 17 includes a cylindrical support 171, one end of which has a support plate 172 extending along its axial direction. Two clamping plates 173 perpendicular to the support plate 172 are symmetrically arranged on the support plate 172 about the axis of the cylindrical support 171. The gap between the two clamping plates 173 is adapted to the inner diameter of the support 171, and a gap is arranged between the two clamping plates 173 on the support plate 172 and the support 171.

[0066] A fifth sleeve 174 is connected to the auxiliary wheel 15, and the auxiliary wheel 15 is rotatably connected to the fifth sleeve 174. A sixth sleeve 175 is inserted into the fifth sleeve 174. A hydraulic rod is provided in the fifth sleeve 174 to drive the sixth sleeve 175 to slide in the fifth sleeve 174.

[0067] One end of the sixth sleeve 175 away from the fifth sleeve 174 is fixedly connected with a hinge shaft 176, and the hinge shaft 176 is inserted into the support 171;

[0068] The gap between the clamping plate 173 and the support 171 is adapted to the size of the sixth sleeve 175. When the hinge shaft 176 is fully inserted into the support 171, the sixth sleeve 175 corresponds to the gap between the support 171 and the clamping plate 173. The sixth sleeve 175 rotates in the support 171 through the hinge shaft 176 until the sixth sleeve 175 contacts the support plate 172. A strong magnetic adsorption component is provided at the position where the sixth sleeve 175 contacts the support plate 172. The support plate 172 is made of metal material and is adsorbed by the strong magnetic adsorption component of the sixth sleeve 175.

[0069] The sixth sleeve 175 slides in the support 171 through the hinge shaft 176 until the hinge shaft 176 is partially placed between the clamps 173. The height of the clamps 173 is slightly higher than the diameter of the hinge shaft 176 and is arranged to fit the side wall of the sixth sleeve 175 to limit the sixth sleeve 175 so that it no longer rotates through the hinge shaft 176.

[0070] In order to prevent the hinge shaft 176 from sliding out from one side of the clamping plate 173 , a limiting plate 19 is provided between the two clamping plates 173 to limit the hinge shaft 176 .

[0071] The above specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0072] The technical features of the above embodiments may be arbitrarily combined (as long as there is no contradiction in the combination of these technical features). To make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

[0073] The above is a relatively specific and detailed description of the utility model through general description and specific embodiments. It should be pointed out that, without departing from the concept of the utility model, it is obvious that several variations and improvements can be made to these specific embodiments, which all belong to the protection scope of this application. Therefore, the protection scope of the patent of this application shall be based on the attached claims.

Claims

1. A convenient trolley, characterized in that: include: Wheels, wherein two wheels are provided and the two wheels are arranged side by side, a frame is provided between the two wheels, and the wheels are rotatably connected to the frame; A support plate, the support plate is arranged on the top of the frame, and the two ends of the support plate are fixedly connected to the frames of the wheels on both sides; A support frame, wherein a strip groove is provided on the support frame, the support frame is fixedly connected to the top of the support plate, and the strip groove is opened in the direction along the forward direction of the trolley; A guide rod, the guide rod is arranged in the strip groove, and the guide rod is slidably connected to the strip groove, and the sliding direction is the horizontal direction and the vertical direction opened along the strip groove; A push rod, which is fixedly connected to one end of the guide rod and serves as the front end of the cart; A clamping jaw, wherein two clamping jaws are provided, and the two clamping jaws are symmetrically arranged above the support plate with respect to the support frame, and a connecting rod is hingedly connected to one end of the clamping jaw close to the push rod, and the two connecting rods are respectively hinged to the two ends of the push rod, and a rotating shaft is also inserted into the clamping jaw, and the bottom end of the rotating shaft is fixedly connected to the support plate, and the clamping rod and the rotating shaft rotate relative to each other or slide along the axial direction of the rotating shaft; A rack, the rack is fixedly connected to the bottom of the support plate, and the position of the rack corresponds to the push rod, and a through groove corresponding to the rack is opened on the support plate; An elastic braking mechanism, which is arranged between the rack and the push rod and is used to brake the forward and backward movement of the push rod when the push rod is subjected to downward pressure; A handle is connected to the frame and is used to push the vehicle body to move.

2. A convenient trolley according to claim 1, characterized in that: The elastic brake mechanism includes a first sleeve, the first sleeve is fixedly connected to the bottom of the push rod, a second sleeve is inserted into the first sleeve, the second sleeve is slidably connected to the first sleeve, a first spring is arranged in the first sleeve, one end of the first spring is fixedly connected to the first sleeve, and the other end of the first spring is fixedly connected to the second sleeve; A gear is provided at the bottom of the second sleeve, the gear is rotatably connected to the second sleeve, and the gear passes through the through groove and engages with the rack. A bracket is fixedly connected to the bottom of the first sleeve, the bracket is provided on one side of the gear, and a tooth block adapted to the gear is provided at the bottom of the bracket.

3. A convenient trolley according to claim 2, characterized in that: A U-shaped frame is fixedly connected to the bottom of the first sleeve, and the U-shaped frame includes a horizontal portion and two vertical portions. The horizontal portion of the U-shaped frame is fixedly connected to the bottom of the first sleeve, and the horizontal portion of the U-shaped frame is sleeved on the second sleeve and the two are slidably connected. The two vertical portions of the U-shaped frame are placed on both sides of the gear rotation direction, and the tooth block is fixedly connected to the bottom of the vertical portion of the U-shaped frame.

4. A convenient trolley according to claim 1, characterized in that: The support plate is fixedly connected to the frame via a lifting mechanism, and the lifting mechanism includes two groups of fourth sleeves, which are respectively fixedly connected to the top of the frame corresponding to the wheel, and the third sleeve is sleeved on and slidably connected to the fourth sleeve. The two sides of the support plate are respectively fixedly connected to the bottom of the two third sleeves, and a reinforcement rod is fixedly connected between the two third sleeves. A hydraulic rod is arranged in the fourth sleeve, and the hydraulic rod is used to drive the third sleeve to slide along the fourth sleeve.

5. The portable trolley according to claim 1, characterized in that: The shape of the clamping jaws is adapted to the shape of the object to be clamped.

6. A convenient trolley according to claim 5, characterized in that: The clamping jaw is arc-shaped or L-shaped.

7. The portable trolley according to claim 1, characterized in that: The push rod is an arc-shaped structure.

8. The portable trolley according to claim 1, characterized in that: The handle is arranged at an angle of 45°-60° with respect to the horizontal plane of the frame, and two handles are provided.

9. The portable trolley according to claim 1, characterized in that: The bicycle also includes auxiliary wheels, which are arranged between the two handles and are connected to the bicycle frame via a lifting assembly.

10. The portable trolley according to claim 9, characterized in that: The lifting assembly includes a fixed seat, which is fixedly connected to the frame between the two wheels, and the fixed seat includes a cylindrical support, one end of which has a support plate extending along its axial direction, and two clamping plates perpendicular to the support plate are symmetrically arranged on the support plate about the axis of the cylindrical support, the gap between the two clamping plates is adapted to the inner diameter of the support, and a gap is arranged between the two clamping plates on the support plate and the support; The auxiliary wheel is connected to a fifth sleeve, the auxiliary wheel is rotatably connected to the fifth sleeve, a sixth sleeve is inserted into the fifth sleeve, and a hydraulic rod is arranged in the fifth sleeve for driving the sixth sleeve to slide in the fifth sleeve; An end of the sixth sleeve away from the fifth sleeve is fixedly connected to a hinge shaft, and the hinge shaft is inserted into the support; The gap between the clamping plate and the support is adapted to the size of the sixth sleeve. When the hinge shaft is fully inserted into the support, the sixth sleeve corresponds to the gap between the support and the clamping plate. The sixth sleeve rotates in the support through the hinge shaft until the sixth sleeve contacts the support plate. A strong magnetic adsorption component is provided at the position where the sixth sleeve contacts the support plate. The support plate is made of metal material and is adsorbed by the strong magnetic adsorption component of the sixth sleeve. The sixth sleeve slides in the support through the hinge shaft until the hinge shaft is partially placed between the clamps. The height of the clamps is slightly higher than the diameter of the hinge shaft and is fitted with the side wall of the sixth sleeve to limit the sixth sleeve so that it no longer rotates through the hinge shaft.

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