CN216148887U - Amphibious expander - Google Patents

Abstract

The application discloses amphibian expander, this amphibian expander includes: the expanding forceps comprise two expanding arms, and a clamping plate is arranged on the opening side formed by the two expanding arms; the expansion head is provided with a cutter groove at one end, the expansion arm is inserted into the cutter groove of the expansion head and is connected through a detachable joint, and the detachable joint comprises a pin shaft, a pin shaft hole, a tungsten steel ball, a compression spring and a jackscrew; the pin shaft is inserted into the pin shaft hole, one end of the pin shaft inserted into the pin shaft hole is provided with a ball groove, and the side surface of the pin shaft hole is provided with a tungsten steel ball extruded by a jackscrew and a compression spring; the tungsten steel ball is clamped in the ball groove on the pin shaft under the extrusion of the compression spring. One end of each connecting rod is connected with the control parts of the two expansion arms, and the other end of each connecting rod is rotatably connected; the piston consists of a piston rod and a piston head arranged at the front end of the piston rod, and the piston head is connected with the connecting ends of the two connecting rods; the piston is arranged in the oil cylinder and is driven by the oil cylinder to move. This application can realize expanding head and expanding the dismantlement of arm and be connected.

Description

Amphibious expander

Technical Field

The application relates to the technical field of rescue equipment, in particular to an amphibious expander.

Background

At present, the hydraulic expander is widely applied to working conditions of disaster relief in ruins, demolition and separation of buildings and the like. Can provide larger expansion force for expanding heavy objects such as reinforced concrete, stone slabs and the like. The existing hydraulic expander comprises an oil inlet, a hand valve, an oil cylinder, a moving device and expanding pincers, wherein in actual use, the expanding pincers are in surface contact with an object to be expanded, the expanding pincers are easily damaged, the whole expanding pincers need to be replaced during maintenance, and the maintenance cost is high.

SUMMERY OF THE UTILITY MODEL

The main technical problem who solves of this application provides an amphibious expander, need change whole expansion pincers when the maintenance that can improve prior art exists, problem that cost of maintenance is high.

In order to solve the technical problem, the application adopts a technical scheme that: there is provided an amphibious expander comprising: the expansion clamp comprises two expansion arms, each expansion arm comprises a fixing part, an expansion part and a control part, the expansion parts and the control parts respectively extend from the fixing parts to directions away from each other, the expansion parts and the control parts are arranged in an obtuse angle by taking the fixing parts as vertexes, and a clamping plate is arranged on the opening side formed by the two expansion arms; the expansion head is provided with a cutter groove at one end, the expansion arm is inserted into the cutter groove of the expansion head and is connected through a detachable joint, and the detachable joint comprises a pin shaft, a pin shaft hole, a tungsten steel ball, a compression spring and a jackscrew; the pin shaft is inserted into the pin shaft hole, one end of the pin shaft inserted into the pin shaft hole is provided with a ball groove, and the side surface of the pin shaft hole is provided with a tungsten steel ball extruded by a jackscrew and a compression spring; the tungsten steel ball is clamped into the ball groove on the pin shaft under the extrusion of the compression spring; one end of each connecting rod is connected with the control parts of the two expansion arms, and the other end of each connecting rod is rotatably connected; the piston consists of a piston rod and a piston head arranged at the front end of the piston rod, and the piston head is connected with the connecting ends of the two connecting rods; the piston is arranged in the oil cylinder and is driven by the oil cylinder to move;

the oil cylinder comprises a cylinder bottom, a cylinder body and a cylinder head, wherein the cylinder bottom and the cylinder head are respectively connected to two ends of the cylinder body, the cylinder body is of a hollow structure and is used for containing oil and at least part of pistons, and the cylinder head is connected with the pistons.

The amphibious expander further comprises a hand valve, one end of the hand valve is connected with the oil cylinder, the other end of the hand valve is connected with the oil inlet, and the hand valve controls the movement state of oil entering the oil inlet in the oil cylinder so as to control the movement state of the piston.

The amphibious expander further comprises a guard plate, the guard plate is arranged around the connecting rod, and the guard plate is connected with the fixing portion of the expanding arm.

Wherein, hand valve one end is formed with first screw thread, is formed with the second screw thread on the oil inlet, and the screw joint is passed through first screw thread and second screw thread cooperation spiro union in hand valve to the oil inlet.

The piston moves along the oil cylinder, the connecting rod rotates around the connecting end, and the opening at the front end is enlarged or reduced.

Wherein, two expansion arms connected with the connecting rod rotate around the fixed part, and the openings of the two expansion arms become larger or smaller.

Wherein, the one end of keeping away from the hand valve of oil inlet is connected with the oil inlet lid, and the oil inlet lid can be dismantled with the oil inlet and be connected or rotate and be connected to cover the oil inlet or open the oil inlet.

Wherein, amphibian expander still is provided with the handle, and the handle includes: one end of the handle connecting part is connected with the connecting rod shell; and the handheld part is connected with the other end of the handle connecting part and is arranged around the connecting rod shell in an arc shape.

Wherein, the outer surface of the amphibious expander is subjected to waterproof and anticorrosion treatment through hard oxidation anticorrosion or corrosion-resistant stainless steel or manganese-zinc phosphating surface treatment.

The beneficial effect of this application is: in distinction from the state of the art, the present application provides an amphibious expander comprising: the expansion clamp comprises two expansion arms, each expansion arm comprises a fixing part, an expansion part and a control part, the expansion parts and the control parts respectively extend from the fixing parts to directions away from each other, the expansion parts and the control parts are arranged in an obtuse angle by taking the fixing parts as vertexes, and a clamping plate is arranged on the opening side formed by the two expansion arms; the expansion head is provided with a cutter groove at one end, the expansion arm is inserted into the cutter groove of the expansion head and is connected through a detachable joint, and the detachable joint comprises a pin shaft, a pin shaft hole, a tungsten steel ball, a compression spring and a jackscrew; the pin shaft is inserted into the pin shaft hole, one end of the pin shaft inserted into the pin shaft hole is provided with a ball groove, and the side surface of the pin shaft hole is provided with a tungsten steel ball extruded by a jackscrew and a compression spring; the tungsten steel ball is clamped in the ball groove on the pin shaft under the extrusion of the compression spring. One end of each connecting rod is connected with the control parts of the two expansion arms, and the other end of each connecting rod is rotatably connected; the piston consists of a piston rod and a piston head arranged at the front end of the piston rod, and the piston head is connected with the connecting ends of the two connecting rods; the piston is arranged in the oil cylinder and is driven by the oil cylinder to move; the amphibious expander expansion head and the expansion arm are detachably connected through the detachable joint, and maintenance is facilitated.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic structural view of an embodiment of the amphibious expander of the present application;

figure 2 is a schematic diagram of an embodiment of a hand valve and oil inlet port of the amphibious expander of figure 1;

figure 3 is a schematic view of the connection of the embodiment of the expansion head and the expansion arms of the amphibious expander of figure 1.

Reference numerals: 1. an oil cylinder; 11. a cylinder bottom; 12. a cylinder body; 13. a cylinder head; 2. a piston; 3. A hand valve; 4. an oil inlet; 5. a connecting rod; 6. an expansion arm; 7. an expansion head; 8. a handle connecting portion; 10. a first thread; 14. a second thread; 15. clamping the plate; 16. a detachable joint; 22. A pin shaft; 23. a tungsten steel ball; 24. a compression spring; 25. carrying out top thread; 26. a ball groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic structural view of an embodiment of the amphibious expander of the present application. The amphibious expander comprises expanding pliers (not shown), a connecting rod 5, a guard plate (not shown), a piston 2, an oil cylinder 1, a hand valve 3, a handle (not shown) and an oil inlet 4.

In the embodiment, the amphibious expander is used for disaster relief in ruins and breaking and dismantling buildings to separate obstacles. The amphibious expander is provided with expanding pliers, the front ends of two expanding arms 6 of the expanding pliers are also provided with expanding heads 7, and when the opening of the expanding pliers is enlarged under the action of the piston 2, the expanding heads 7 on the expanding arms 6 can expand and separate objects. Meanwhile, the inner sides of the openings of the two expansion arms 6 are provided with clamping plates (not shown), when the opening of the expansion clamp is reduced under the action of the piston 2, the clamping plates on the inner sides of the openings of the expansion arms 6 can clamp objects, for example, the objects expanded by the amphibious expander can be clamped and restored. A hand valve 3 is directly connected with an oil inlet 4, the oil inlet 4 is externally connected with a driving mechanism, and the external driving mechanism changes the opening size of an expansion clamp to expand and separate obstacles by inputting oil.

In the present embodiment, the dilating forceps comprise two dilating arms 6, and the dilating arms 6 comprise a fixing portion (not shown), a dilating portion (not shown) and a control portion (not shown). The expansion part and the control part respectively extend from the fixing part to the direction away from each other, and the expansion part and the control part are arranged in an obtuse angle by taking the connecting part as a vertex. And one end of each connecting rod 5 is connected with the two expansion arms 6, and the other end of each connecting rod 5 is rotatably connected. The guard plate is arranged around the connecting rod and is connected with the fixing part of the expansion arm. The piston 2, the piston 2 is by the piston rod (not marked in the figure) and set up the piston head (not marked in the figure) constitution at the piston rod front end, the piston head is connected with two connecting rods 5 link. The device comprises an oil cylinder 1 and a piston 2, wherein the piston 2 is arranged in the oil cylinder 1, and the piston 2 is driven by the oil cylinder 1 to move. And one end of the hand valve 3 is connected with the oil cylinder 1, the other end of the hand valve 3 is connected with the oil inlet 4, and the hand valve 3 controls the movement state of oil entering from the oil inlet 4 in the oil cylinder 1 so as to control the movement state of the piston 2. Specifically, the expansion arm is the primary structure that amphibious expander can realize expanding separation barrier function, utilize hand valve 3 to connect oil inlet 4 and hydro-cylinder 1, inject the oil into 1 through oil inlet 4 in the hydro-cylinder, piston 2 in the oil extrusion hydro-cylinder 1 in the hydro-cylinder 1, realize the motion of piston 2, piston 2 promotes two connecting rod 5 links through the piston head, two connecting rods rotate around the link, the connecting rod rotates and promotes two expansion arms through the control part of two expansion arms and rotate around the fixed part of being connected with the backplate, expansion arm opening grow, realize the function of separation barrier.

In the present embodiment, an oil inlet cover (not shown) is connected to an end of the oil inlet 4 away from the hand valve 3, and the oil inlet cover is detachably or rotatably connected to the oil inlet 4 to cover the oil inlet 4 or open the oil inlet 4. Specifically, when the equipment is not in a working state and is not externally connected with a driving mechanism, the oil inlet cover is covered to prevent sundries from being mixed into the oil cylinder 1 through the oil inlet 4, and the function of protecting the equipment can be achieved.

In this embodiment, the oil cylinder 1 includes a bottom 11, a body 12 and a head 13, the bottom 11 and the head 13 are respectively connected to two ends of the body 12, the body 12 is a hollow structure for containing oil and at least a portion of the piston 2 therein, and the head 13 is connected to the piston 2. Specifically, the oil cylinder 1 is a container with one open surface and other sealed surfaces, the cavity of the cylinder body 12 of the oil cylinder 1 can only extrude or release oil inwards through the oil inlet 4, when the oil in the cavity becomes more, the oil pushes the piston 2 to move outwards of the cylinder body 12, and when the oil in the cavity becomes less, the piston 2 is pulled to move inwards of the cylinder body 12.

In this embodiment, one end of the piston 2 is movably connected with the oil cylinder 1, the piston head at the other end is connected with the connecting ends of the two connecting rods 5, the piston 2 moves along the oil cylinder 1, the connecting rods 5 rotate around the connecting ends, and the front end opening is enlarged or reduced. Specifically, the piston 2 moves in the oil cylinder 1, and when the piston 2 pushes the connecting part of the connecting rod 5, the opening of the connecting rod 5 becomes large. When the piston 2 pulls the connecting portion of the connecting rod 5, the opening of the connecting rod 5 becomes small.

In this embodiment, the link 5 rotates around the connecting end, and the front opening becomes larger or smaller, while the two expansion arms 6 connected to the link 5 rotate around the fixing portion, and the openings of the two expansion arms 6 become larger or smaller. Specifically, when the piston 2 pushes the connecting end of the connecting rod 5 to enlarge the opening of the connecting rod 5, the connecting rod 5 enlarges the opening of the expansion part of the two expansion arms 6 through the control part connected with the two expansion arms 6. When the piston 2 pulls the connecting end of the connecting rod 5 to reduce the opening of the connecting rod 5, the connecting rod 5 reduces the opening of the expansion parts of the two expansion arms 6 through the control part connected with the two expansion arms 6. When the opening of the expansion part of the expansion arm 6 becomes large, the function of expanding and separating the obstacle can be realized.

In the present embodiment, the opening side formed by the two expansion arms 6 is further provided with a clamping plate 15. Specifically, when the opening of the expansion part of the expansion arm 6 becomes large, the expander separates the obstacle through the expansion arm 6, and when the opening of the expansion part of the expansion arm 6 becomes small, the expander can press the obstacle through the clamping plate 15 on the opening side of the expansion arm 6, for example, the opening of the object which is enlarged by the expansion opening becomes small. In order to prevent the clamping plate 15 from damaging the object when clamping the object, the surface of the clamping plate 15 is covered with a scratch-proof material or is subjected to other protection treatment.

In this embodiment the amphibious expander is further provided with a handle comprising a handle connection portion 8 and a hand grip portion 9. One end of the handle connecting part 8 is connected with the guard plate, and the handheld part 9 is connected with the other end of the handle connecting part 8. Is arranged around the shell of the connecting rod 5 in an arc shape. In other embodiments, the handle 9 may be provided with an anti-slip part or designed in a handle shape to facilitate grasping by the user. The handle is arranged, so that the product is more convenient to take and use.

In this embodiment, the outer surface of the amphibious expander is treated by hard oxidation corrosion protection or surface treatment with corrosion resistant stainless steel or manganese zinc phosphating for water and corrosion protection. Particularly, after waterproof and anticorrosive treatment, the expander equipment can be used in a land environment and a water bottom environment, so that the expander equipment is suitable for more rescue environments. The waterproof and antiseptic treatment methods are not exclusive, and the embodiment only shows a part of the treatment methods, and other changes to the treatment methods based on the utility model are all included in the scope of the utility model.

Further, in some specific embodiments, an illumination lamp can be further disposed at the handle. The illumination lamp can be arranged at the end or the side of the handle. The light has the illumination effect, and when equipment worked under the dark surrounds, the light can make things convenient for staff's rescue work.

Distinguished from the prior art, the present application provides an amphibious expander. The amphibious expander comprises: the expansion clamp comprises two expansion arms, each expansion arm comprises a fixing part, an expansion part and a control part, the expansion parts and the control parts respectively extend from the fixing parts to directions away from each other, the expansion parts and the control parts are arranged in an obtuse angle by taking the fixing parts as vertexes, and a clamping plate is arranged on the opening side formed by the two expansion arms; one end of each connecting rod is connected with the control parts of the two expansion arms, and the other end of each connecting rod is rotatably connected; the guard plate is arranged around the connecting rod and is connected with the fixing part of the expansion arm; the piston consists of a piston rod and a piston head arranged at the front end of the piston rod, and the piston head is connected with the connecting ends of the two connecting rods. The piston is arranged in the oil cylinder and is driven by the oil cylinder to move; and one end of the hand valve is connected with the oil cylinder, the other end of the hand valve is connected with the oil inlet, and the hand valve controls the movement state of oil entering from the oil inlet in the oil cylinder so as to control the movement state of the piston. The amphibious expander has the advantages that the oil inlet and the hand valve are directly connected, transition joint parts are omitted, the device is more stable, the sealing structure is reduced, the risk of hidden oil leakage hazards is reduced, and meanwhile the machining cost can be reduced.

Referring to fig. 2, fig. 2 is a schematic structural view of an embodiment of a hand valve and an oil inlet of the amphibious expander in fig. 1.

In the embodiment, one end of the hand valve 3 is formed with a first thread 10, the oil inlet 4 is formed with a second thread 14, and the oil inlet 4 is screwed to the hand valve 3 through the matching of the first thread 10 and the second thread 14. Specifically, the hand valve 3 that has the screw line through one end screws into the oil inlet 4 that one end has the screw hole through hand valve 3 between hand valve 3 and the oil inlet 4 and is connected, need not use excessive part to come both ends and connect hand valve 3 and oil inlet 4 respectively, has reduced the processing cost, and seal structure becomes less one, has reduced oil leak hidden danger risk, and the product is more stable.

In the embodiment, the oil inlet 4 and the hand valve 3 are not fixed in a direct connection mode, in the embodiment, threads are respectively arranged on the oil inlet 4 and the hand valve 3, and the hand valve 3 and the oil inlet 4 are fixed by utilizing thread matching. For example, in other embodiments, the oil inlet 4 and the hand valve 3 can be directly connected by matching a buckle with a sealing strip or matching a stud with a sealing strip. It can be understood that the oil inlet 4 can be directly connected with the hand valve 3 and can avoid oil leakage, and the internal structure of the oil inlet can be adjusted as required. This embodiment is merely an illustration of one specific embodiment.

In other embodiments, the connection between the hand valve 3 and the oil cylinder 1 can also be realized through threads and threaded holes, threads are formed on the outer side of one end of the hand valve 3, threads matched with the threads are correspondingly formed at the position where the cylinder bottom 11 is connected with the hand valve 3, and the hand valve 3 is screwed to the oil cylinder 1 through thread matching. The connection mode of the hand valve 3 and the cylinder head 13 is not fixed, and can be adjusted according to requirements.

In the embodiment, the oil inlet 4 is connected with the hand valve 3, the hand valve 3 is connected with the cylinder bottom 11, and a communicated oil path is further arranged between the hand valve 3 and the cylinder bottom 11. Specifically, an external driving mechanism injects oil into the amphibious expander through the oil inlet 4, the oil sequentially passes through the oil inlet 4 and the hand valve 3 and enters the cylinder cavity of the oil cylinder 1 from the cylinder bottom 11 through an oil way, the oil extrudes the piston 2, and the piston 2 is enabled to move outwards after being pressed. On the contrary, the oil in the oil cylinder 1 is sucked by the driving mechanism, so that the oil in the oil cylinder 1 is reduced, and the piston 2 is pulled to move in the cavity of the oil cylinder 1.

Be different from prior art, this application provides a hand valve of amphibian expander and connected mode of oil inlet, and the one end of hand valve is formed with first screw thread, is formed with the second screw thread on the oil inlet, and the oil inlet is through the cooperation spiro union in hand valve of first screw thread and second screw thread. The hand valve with the screw thread at one end is screwed into the oil inlet with the screw hole at one end to be connected between the hand valve and the oil inlet, so that the two ends of the hand valve are respectively connected with the hand valve and the oil inlet without using excessive parts, the processing cost is reduced, the sealing structure is reduced by one, the risk of hidden danger of oil leakage is reduced, and the product is more stable.

Referring to fig. 3, fig. 3 is a schematic view of the connection structure of the embodiment of the expansion head 7 and the expansion arm 6 of the amphibious expander in fig. 1.

Referring to fig. 3, in the present embodiment, the detachable joint 16 includes a pin 22, a pin hole (not shown), a tungsten steel ball 23, a compression spring 24, and a jackscrew 25. The pin 22 is inserted into the pin hole, one end of the pin 22 inserted into the pin hole is provided with a ball groove 26, and the side surface of the pin hole is provided with a tungsten steel ball 23 extruded by a jackscrew 25 and a compression spring 24. The pin 22 is inserted into the pin hole at one end of the expansion head 7, and the tungsten steel ball 23 is clamped into the ball groove 26 on the pin 22 under the extrusion of the compression spring 24. In particular, the expansion head 7 is connected to the expansion arm 6 by means of a removable joint 16. The expansion head 7 is provided with a cutter groove, the expansion arm 6 is inserted into the cutter groove, the expansion head 7 is fixed with the expansion arm 6 by inserting the expansion arm 6 into a pin shaft hole at the cutter groove of the expansion head 7 through a pin shaft 22, wherein a small hole is formed in the side surface of the pin shaft hole, used for expanding the expansion head 7, of a ball groove 26 formed in the front end of the pin shaft 22, a tungsten steel ball 23 is embedded into the ball groove 26 of the pin shaft 22 through the small hole, and a small ball is fixed by a compression spring 24 and a jackscrew 25, so that the expansion head 7 and the expansion arm 6 are fixed, when the expansion head 7 needs to be replaced, the pin shaft 22 is pressed in the opposite direction, the pin shaft 22 can be taken out, and the expansion head 7 and the expansion arm 6 can be detached.

Be different from prior art, this application provides an amphibious expander realizes expansion head and expansion arm detachable joint. The detachable joint utilizes and sets up the ball groove at the one end that the round pin axle inserted the round pin shaft hole, utilizes compression spring and jackscrew to push away the ball and get into the ball groove of round pin axle front end at one side aperture in round pin shaft hole, realizes expanding head and expansion arm's fixed to when pressing the round pin axle in the opposite direction, can realize expanding head and the dismantlement of expansion arm. The detachable joint enables the easily damaged expansion head to be convenient to replace, the maintenance cost is saved, and meanwhile, the installation is fast, simple and convenient.

The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.

Claims (10)

1. An amphibious expander, characterised in that the amphibious expander comprises:

the expansion clamp comprises two expansion arms, each expansion arm comprises a fixing part, an expansion part and a control part, the expansion parts and the control parts respectively extend from the fixing parts to directions away from each other, the expansion parts and the control parts are arranged in an obtuse angle by taking the fixing parts as vertexes, and a clamping plate is arranged on the opening side formed by the two expansion arms;

the expansion head is provided with a cutter groove at one end, the expansion arm is inserted into the cutter groove of the expansion head and connected through a detachable joint, the detachable joint comprises a pin shaft, a pin shaft hole, a tungsten steel ball, a compression spring and a jackscrew, the pin shaft is inserted into the pin shaft hole, one end of the pin shaft inserted into the pin shaft hole is provided with a ball groove, and the tungsten steel ball extruded by the jackscrew and the compression spring is arranged on the side surface of the pin shaft hole; the tungsten steel ball is clamped into the ball groove on the pin shaft under the extrusion of the compression spring;

one end of each of the two connecting rods is connected with the control part of each of the two expansion arms, and the other end of each of the two connecting rods is rotatably connected with the control part of each of the two expansion arms;

the piston consists of a piston rod and a piston head arranged at the front end of the piston rod, and the piston head is connected with the connecting ends of the two connecting rods;

the piston is arranged in the oil cylinder and is driven by the oil cylinder to move.

2. The amphibious expander of claim 1, wherein the cylinder comprises a bottom, a body and a head, the bottom and the head are respectively connected to two ends of the body, the body is a hollow structure for containing oil and at least part of the piston therein, and the head is connected to the piston.

3. The amphibious expander of claim 1, further comprising a hand valve, one end of the hand valve being connected to the cylinder and the other end being connected to the oil inlet, the hand valve controlling the movement of oil entering the oil inlet in the cylinder and thus the activation of the piston.

4. The amphibious expander of claim 1, further comprising a shield disposed about the link, the shield connecting the fixed portion of the expander arm.

5. The amphibious expander of claim 3, wherein the hand valve has a first thread formed at one end and a second thread formed on the oil inlet, the oil inlet being threadably connected to the hand valve by the first thread cooperating with the second thread.

6. The amphibious expander of claim 5, wherein the piston is movably connected to the cylinder at one end and connected to the connecting ends of the connecting rods at the other end, the piston moves along the cylinder, the connecting rods rotate around the connecting ends, and the front opening is enlarged or reduced.

7. The amphibious expander of claim 6, wherein the expansion arms connected to the link rotate about the fixed portion, and wherein the expansion arm openings become larger or smaller.

8. The amphibious expander of claim 3, wherein an oil inlet cover is attached to an end of the oil inlet remote from the hand valve, the oil inlet cover being removably or rotatably attached to the oil inlet to cover or uncover the oil inlet.

9. An amphibious expander as claimed in claim 4, in which the amphibious expander is further provided with a handle comprising:

one end of the handle connecting part is connected with the guard plate;

and the handheld part is connected with the other end of the handle connecting part and is arranged around the connecting rod shell in an arc shape.

10. An amphibious expander as claimed in claim 1, in which the outer surface of the amphibious expander is treated by hard oxidation corrosion protection or phosphatisation using corrosion resistant stainless steel or manganese zinc for water and corrosion protection.

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