Portable hydraulic cone coupling wrench

Abstract

The utility model discloses a portable hydraulic taper sleeve connecting pliers relates to reinforcing bar connecting tool technical field, including connecting structure, calliper structure and hydraulic structure, and connecting structure includes reinforcing bar spare and taper sleeve adjusting head, and two reinforcing bar spares are set up coaxially in vertical direction, and taper sleeve adjusting head is set up in two reinforcing bar spare junction, and calliper structure includes connecting piece, reversing support and dog part, and connecting piece sets up in the one side of the circumference of taper sleeve adjusting head. The portable hydraulic taper sleeve connecting pliers combines calliper structure and hydraulic structure together, makes the body of hydraulic pliers whole small and light, can directly handheld use, therefore is not limited by the power supply condition and small space operation on the spot, and hydraulic pliers can use in various complex construction environment, greatly promotes the use convenience and practicality of hydraulic pliers, in addition, hydraulic pliers structure is simple, and the operation is simple, adopts handheld use to reduce the hoisting and other dangerous operation, effectively improves the safety in the construction process.

Description

Technical Field

[0001] This utility model relates to the field of rebar connection tools, and more specifically, to a hand-held hydraulic tapered sleeve connection pliers. Background Technology

[0002] In the construction process, tapered sleeve locking rebar joints are a commonly used connection method. They allow for visual inspection of rebar connection quality, ensuring reliable connection quality and high safety. They can improve construction efficiency and quality while ensuring the force transmission performance of the joint, thus accelerating the industrialization of rebar engineering construction. However, the installation and use of tapered sleeve locking rebar joints require a large amount of mechanical force, so the installation of tapered sleeve locking rebar joints usually requires installation tools such as pliers.

[0003] Existing tapered sleeve installation tools have many problems. First, most of the equipment is large in size, usually consisting of a hydraulic press and hydraulic clamps, which need to be connected by a connecting pipe, making the equipment very inconvenient to transport and use. Second, these devices are greatly affected by site conditions, such as power supply conditions and limitations of working in confined spaces, which restricts the scope of use of the equipment. Finally, due to the large size of the equipment, it cannot be used by hand directly during construction and requires hoisting or other methods, which increases the complexity and danger of operation. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a portable hydraulic tapered sleeve connecting pliers, which integrates the hydraulic system and pliers device into one integrated portable tool with features such as small size, light weight, simple structure, easy operation, and strong adaptability. It can realize the rapid, stable, and efficient installation of tapered sleeve locking rebar joints.

[0005] To achieve the above objectives, this utility model provides a handheld hydraulic tapered sleeve connecting pliers, comprising:

[0006] The connecting structure includes two vertically coaxially arranged steel bars and a tapered adjusting head sleeved at the connection of the two steel bars;

[0007] The caliper structure includes a connector disposed on one side of the tapered sleeve adjusting head in the circumferential direction, a reversing support rotatably mounted at both ends of the connector, and a pawl component mounted on one side of the reversing support in the length direction. The two pawl components are symmetrically arranged and are respectively located on both sides of the tapered sleeve adjusting head in the length direction.

[0008] The hydraulic structure includes a positioning rod that slides horizontally through the middle of the connector, an oil tank installed on the side of the positioning rod away from the tapered sleeve adjusting head, a double-headed hydraulic cylinder and an oil storage chamber installed vertically in the oil tank, a drive assembly installed on the oil tank for driving the double-headed hydraulic cylinder, and a fluid guiding structure disposed in the oil tank for realizing oil transfer; the two ends of the double-headed hydraulic cylinder are respectively hinged to the sides of the upper and lower reversing supports away from the claw components.

[0009] Furthermore, the tapered sleeve adjusting head includes a tapered sleeve fitted at the connection of the two steel bars and concave sleeves placed at both ends of the tapered sleeve along its length; the concave sleeve has a tapered wall, the two concave sleeves are symmetrically arranged, and the end of the concave sleeve with the larger diameter faces the tapered sleeve.

[0010] Furthermore, the double-headed hydraulic cylinder includes a cylinder barrel vertically installed in the oil tank and piston rods vertically inserted at both ends of the cylinder barrel. The piston rod is provided with a piston adapted to the inner wall of the cylinder barrel at one end inside the cylinder barrel.

[0011] Furthermore, the fluid guiding structure includes a second conduit installed between the cylinder and the oil storage chamber, and a pressure relief valve installed in the second conduit, the pressure relief valve extending to the outside of the oil tank on the side opposite to the second conduit.

[0012] Furthermore, the chuck component includes a fixed chuck fixedly installed on the side of the reversing brace near the tapered sleeve adjusting head, a rotating chuck rotatably installed on the side of the reversing brace near the tapered sleeve adjusting head, and a stop block rotatably installed in the fixed chuck and the rotating chuck. The rotation axis of the stop block in the fixed chuck and the rotating chuck is horizontally arranged, and the stop block is triangular in shape, with one side of the triangle facing the tapered sleeve adjusting head.

[0013] Furthermore, a handle is installed on one side of the connector in the width direction.

[0014] Furthermore, the drive assembly includes a hydraulic pump mounted on the outer wall of the oil tank, a pressure rod hinged to the hydraulic pump, a connecting rod hinged to the outer wall of the oil tank and hinged to the pressure rod, and a first conduit mounted on the bottom of the hydraulic pump housing and communicating with the oil storage cavity. A second check valve is disposed inside the first conduit. A first check valve is disposed on the side of the hydraulic pump near the oil tank, and the end of the first check valve opposite to the hydraulic pump passes through the outer wall of the oil tank and communicates with the cylinder.

[0015] Furthermore, elastic members connected to the reversing brace are installed on both the upper and lower sides of the oil tank.

[0016] Furthermore, the drive assembly includes a gear pump and a drive unit mounted on the outer wall of the oil tank, as well as a third conduit mounted on the input end of the gear pump and communicating with the oil storage cavity; the drive shaft of the drive unit is fixedly connected to the drive wheel in the gear pump, and the output end of the gear pump is connected to the cylinder.

[0017] Furthermore, a battery is fixedly installed on the outer wall of the fuel tank, the drive component is electrically connected to the battery, and a handle is fixedly installed on the side of the fuel tank away from the connector, and a switch for controlling the operation of the drive component is provided on the handle.

[0018] Compared with the prior art, this utility model has the following advantages and effects:

[0019] 1. The handheld hydraulic tapered sleeve connecting pliers of this utility model combine a plier structure and a hydraulic structure, making the hydraulic pliers compact and lightweight, and allowing for direct hand-held use. Therefore, they are not limited by on-site power conditions or small space operations, and can be used in various complex construction environments, greatly improving the ease of use and practicality of the hydraulic pliers. In addition, the hydraulic pliers have a simple structure and are easy to operate. The handheld use reduces dangerous operations such as hoisting, effectively improving safety during construction.

[0020] 2. The portable hydraulic tapered sleeve connecting pliers of this utility model utilize a compact structural design to reduce the connection and disassembly between components, thereby improving the stability and reliability of the tool. The adjustable design of the jaw structure can adapt to the installation requirements of tapered sleeves with different rebar diameters, greatly enhancing the adaptability of the hydraulic pliers. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the manual embodiment of the handheld hydraulic tapered sleeve connecting pliers in this utility model.

[0022] Figure 2 for Figure 1 A schematic diagram of the structure of the drive component;

[0023] Figure 3 This is a schematic diagram of the electric embodiment of the hand-held hydraulic tapered sleeve connecting pliers in this utility model.

[0024] Figure 4 for Figure 3 A schematic diagram of the structure of the drive component;

[0025] Figure 5 for Figure 1 or Figure 2 A schematic diagram of the cross-sectional structure.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Pressure rod; 2-Reversing brace; 3-Claw component; 31-Fixed claw; 32-Rotating claw; 33-Abutting block; 4-Conical sleeve adjusting head; 41-Concave sleeve; 42-Conical sleeve; 5-Connecting piece; 6-Hydraulic pump; 61-First guide tube; 7-Oil tank; 71-Oil storage cavity; 8-Double-headed hydraulic cylinder; 81-Cylinder barrel; 82-Piston rod; 83-Second guide tube; 9-Positioning rod; 10-Handle; 11-Pressure relief valve; 12-Reinforcing steel piece; 13-Elastic piece; 14-Grip; 141-Switch; 15-Driver; 16-Gear pump; 17-Battery; 18-Third guide tube; 19-Connecting rod. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Please see Figure 1-5 As shown in the figure, this utility model embodiment provides a handheld hydraulic tapered sleeve connecting pliers, including a connecting structure, a plier structure, and a hydraulic structure.

[0031] The connecting structure includes a steel bar 12 and a conical sleeve adjusting head 4. The two steel bar 12 are vertically coaxially arranged, and the conical sleeve adjusting head 4 is sleeved at the connection of the two steel bar 12. This facilitates the connection of the two steel bar 12 by using the tight connection between the conical sleeve adjusting head 4 and the steel bar 12 after the conical sleeve adjusting head 4 is compressed.

[0032] The caliper structure includes a connector 5, a reversing brace 2, and a jaw component 3. The connector 5 is located on the circumferentially upward side of the tapered sleeve adjusting head 4. The reversing brace 2 is rotatably mounted at both ends of the connector 5. The jaw component 3 is mounted on one side along the length of the reversing brace 2. The two jaw components 3 are symmetrically arranged and are located on both sides along the length of the tapered sleeve adjusting head 4. This allows the rotation of the reversing brace 2 on the connector 5 to drive the movement of the two jaw components 3. When the two jaw components 3 come close to each other, they can press against the tapered sleeve adjusting head 4 from both ends.

[0033] The hydraulic structure includes a positioning rod 9, an oil tank 7, a double-headed hydraulic cylinder 8, an oil storage chamber 71, a drive assembly, and a fluid guiding structure. The positioning rod 9 slides horizontally through the middle of the connector 5. The oil tank 7 is installed on the side of the positioning rod 9 away from the cone sleeve adjusting head 4. The double-headed hydraulic cylinder 8 and the oil storage chamber 71 are vertically installed in the oil tank 7. The drive assembly is installed on the oil tank 7 and is used to drive the double-headed hydraulic cylinder 8. The fluid guiding structure is set in the oil tank 7 and is used to realize oil transmission. The two ends of the double-headed hydraulic cylinder 8 are respectively hinged to the side of the upper and lower reversing supports 2 away from the claw component 3.

[0034] As a further description of the above scheme, when the set drive component drives the double-headed hydraulic cylinder 8 to operate, the double-headed hydraulic cylinder 8 drives the two reversing supports 2 to separate from the side away from the claw component 3, so that the two reversing supports 2 move closer to the end where the claw component 3 is set, so as to convert the hydraulic power into the squeezing force on the cone sleeve adjusting head 4 through the lever principle.

[0035] Please see Figure 1-5 As shown, the conical sleeve adjusting head 4 includes a conical sleeve 42 fitted at the connection of two reinforcing bars 12 and concave sleeves 41 placed at both ends of the conical sleeve 42 along its length. The concave sleeve 41 has a conical hole wall and the two concave sleeves 41 are symmetrically arranged. The end of the concave sleeve 41 with a larger hole diameter faces the conical sleeve 42. When the concave sleeves 41 at both ends of the concave sleeve 42 are squeezed, the conical sleeve 42 will be squeezed by the diameter reduction of the concave sleeves 41, thereby achieving a tightening effect and a tight fit with the outer wall of the reinforcing bar 12.

[0036] Please see Figure 1-5 As shown, the double-headed hydraulic cylinder 8 includes a cylinder 81 vertically installed in the oil tank 7 and piston rods 82 vertically inserted at both ends of the cylinder 81. One end of the piston rod 82 located inside the cylinder 81 is provided with a piston that is adapted to the inner wall of the cylinder 81. This facilitates the synchronous movement of the two piston rods 82 under the squeezing operation of the oil in the cylinder 81, thereby using the telescopic piston rods 82 to drive the reversing support 2 to rotate.

[0037] Please see Figure 1 , Figure 3 and Figure 5As shown, the fluid guiding structure includes a second conduit 83 and a pressure relief valve 11. The second conduit 83 is installed between the cylinder 81 and the oil storage chamber 71, and the pressure relief valve 11 is installed inside the second conduit 83. The side of the pressure relief valve 11 away from the second conduit 83 extends to the outside of the oil tank 7. This allows for convenient control of the opening and closing of the second conduit 83 using the pressure relief valve 11. When the pressure relief valve 11 is opened to allow the second conduit 83 to be open, the oil in the cylinder 81 can enter the oil storage chamber 71 along the second conduit 83.

[0038] Please see Figure 1-4 As shown, the chuck component 3 includes a fixed chuck 31, a rotating chuck 32, and a stop block 33. The fixed chuck 31 is fixedly installed on the reversing support 2 near the cone sleeve adjusting head 4. The rotating chuck 32 is rotatably installed on the reversing support 2 near the cone sleeve adjusting head 4. The stop block 33 is rotatably installed inside the fixed chuck 31 and the rotating chuck 32. The rotation axis of the stop block 33 is horizontally arranged inside the fixed chuck 31 and the rotating chuck 32. The stop block 33 is triangular in shape, and one side of the triangle faces the cone sleeve adjusting head 4.

[0039] As a further description of the above scheme, by rotating and adjusting the rotating claw 32, the included angle between the fixed claw 31 and the rotating claw 32 can be adapted to the size of the steel bar 12 of different dimensions. In addition, during the relative movement of the two claw components 3, the set abutment 33 can adapt to the change of the tilt angle between the claw component 3 and the cone sleeve adjustment head 4 by rotating itself, so that the long side of the abutment 33 always fits the end face of the concave sleeve 41, thereby facilitating and stabilizing the transmission of the extrusion effect.

[0040] Please see Figure 1 and Figure 3 As shown, a handle 10 is installed on one side of the connector 5 in the width direction; the handle 10 on the connector 5 makes it easy to hold and pick up the caliper, so as to facilitate carrying and transport.

[0041] Please see Figure 1-2 As shown, the drive assembly includes a hydraulic pump 6, a pressure rod 1, a connecting rod 19, and a first conduit 61. The hydraulic pump 6 is mounted on the outer wall of the oil tank 7. The pressure rod 1 is hinged to the hydraulic pump 6. The connecting rod 19 is hinged to the outer wall of the oil tank 7 and is hinged to the pressure rod 1. The first conduit 61 is mounted on the bottom of the housing of the hydraulic pump 6 and communicates with the oil storage chamber 71. A first check valve is provided on the side of the hydraulic pump 6 near the oil tank 7, and the end of the first check valve away from the hydraulic pump 6 passes through the outer wall of the oil tank 7 and communicates with the cylinder 81. A second check valve is provided inside the first conduit 61.

[0042] As a further description of the above scheme, the rotation of the pressure rod 1 can drive the telescopic rod in the hydraulic pump 6 to move. When the telescopic rod moves upward, the hydraulic pump 6 can use the first conduit 61 to draw oil from the oil storage chamber 71. When the telescopic rod moves downward, the oil in the hydraulic pump 6 can enter the cylinder 81 through the first check valve, thereby causing the piston rod 82 in the cylinder 81 to move outward. During this process, the second check valve can prevent the oil in the hydraulic pump 6 from flowing back to the oil storage chamber 71 from the first conduit 61.

[0043] Please refer to Figure 1-2 As shown, elastic elements 13 connected to the reversing brace 2 are installed on both the upper and lower sides of the oil tank 7. When the pressure relief valve 11 is opened to operate the pressure relief of the double-headed hydraulic cylinder 8, the elastic retraction of the elastic element 13 can be used to move the upper and lower reversing braces 2 toward the double-headed hydraulic cylinder 8, thereby squeezing the piston rod 82 in the double-headed hydraulic cylinder 8, accelerating the discharge speed of the oil in the cylinder barrel 81 of the double-headed hydraulic cylinder 8, and making the caliper structure quickly return to its original state.

[0044] Please see Figure 3-4 As shown, the drive assembly includes a gear pump 16, a drive unit 15, and a third conduit 18. The gear pump 16 and the drive unit 15 are mounted on the outer wall of the oil tank 7. The third conduit 18 is mounted on the input end of the gear pump 16 and communicates with the oil storage chamber 71. The drive shaft of the drive unit 15 is fixedly connected to the drive wheel in the gear pump 16, and the output end of the gear pump 16 is communicated with the cylinder 81.

[0045] As a further description of the above scheme, the operation of the drive component 15 can drive the drive wheel in the gear pump 16 to rotate, thereby enabling the gear pump 16 to transport the oil in the oil storage chamber 71 to the cylinder 81 through the third conduit 18. This causes the piston rod 82 in the double-headed hydraulic cylinder 8 to extend and retract outward, thereby driving the clamping function of the caliper structure. When it is necessary to extend the caliper structure, simply open the pressure relief valve 11 to allow the oil in the cylinder 81 to enter the oil storage chamber 71 through the second conduit 83, which will restore the double-headed hydraulic cylinder 8 and the caliper structure to their original state.

[0046] Please see Figure 3-4 As shown, a battery 17 is fixedly installed on the outer wall of the fuel tank 7, and the drive component 15 is electrically connected to the battery 17. A handle 14 is fixedly installed on the side of the fuel tank 7 away from the connector 5. A switch 141 for controlling the operation of the drive component 15 is provided on the handle 14. The battery 17 can be used as a mobile power source to power the operation of the drive component 15, so as to facilitate movement while ensuring the caliper's performance. The handle 14 increases the grip position during use, thereby improving the user's control over the caliper's structure and enhancing the stability of the caliper. The switch 141 on the handle 14 can be used to control the operation of the drive component 15.

[0047] The working process of the above-mentioned portable hydraulic tapered sleeve connecting pliers is as follows:

[0048] When using this handheld hydraulic tapered sleeve connecting pliers, the tapered sleeve adjusting head 4 must first be installed at the connection point of the two steel bars 12. Then, the two jaw components 3 in the pliers structure are positioned at both ends of the tapered sleeve adjusting head 4. After that, the oil in the oil storage chamber 71 can be transported to the cylinder 81 in the double-headed hydraulic cylinder 8 through the set drive component, so that the piston rod 82 in the double-headed hydraulic cylinder 8 can move outward under the push of the oil.

[0049] The movement of piston rod 82 can drive the reversing support 2 in the caliper structure to rotate. When piston rod 82 moves in the direction of movement, the two jaw components 3 in the caliper structure can move closer under the action of leverage, thereby squeezing the tapered sleeve adjusting head 4. This causes the two concave sleeves 41 in the tapered sleeve adjusting head 4 to move closer and squeeze the tapered sleeve 42, so that the tapered sleeve 42 tightens and clamps the steel bar 12, so as to use the gripping force of the tapered sleeve adjusting head 4 to maintain the connection stability of the connection node of the steel bar 12.

[0050] It should be noted that the drive assembly can be manually driven by a hydraulic pump 6, a pressure rod 1, a connecting rod 19 and a first conduit 61, or electrically driven by a gear pump 16, a drive unit 15 and a third conduit 18.

[0051] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A portable hydraulic tapered sleeve connecting pliers, characterized in that, include: The connecting structure includes two vertically coaxially arranged steel bars (12) and a tapered adjusting head (4) sleeved at the connection of the two steel bars (12). The caliper structure includes a connector (5) disposed on one side of the tapered sleeve adjusting head (4) in the circumferential direction, a reversing support (2) rotatably mounted on both ends of the connector (5), and a claw component (3) mounted on one side of the reversing support (2) in the length direction. The two claw components (3) are symmetrically arranged, and the two claw components (3) are respectively located on both sides of the tapered sleeve adjusting head (4) in the length direction. The hydraulic structure includes a positioning rod (9) that slides horizontally through the middle of the connector (5), an oil tank (7) installed on the side of the positioning rod (9) away from the tapered sleeve adjusting head (4), a double-headed hydraulic cylinder (8) and an oil storage chamber (71) installed vertically in the oil tank (7), a drive assembly installed on the oil tank (7) for driving the double-headed hydraulic cylinder (8) to operate, and a fluid guiding structure set in the oil tank (7) for realizing oil transmission; the two ends of the double-headed hydraulic cylinder (8) are respectively hinged to the side of the upper and lower reversing supports (2) away from the claw component (3).

2. The hand-held hydraulic tapered sleeve connecting pliers according to claim 1, characterized in that, The tapered sleeve adjusting head (4) includes a tapered sleeve (42) fitted at the connection of the two steel bars (12) and concave sleeves (41) placed at both ends of the tapered sleeve (42) along its length. The concave sleeve (41) has a tapered hole wall and the two concave sleeves (41) are symmetrically arranged. The end of the concave sleeve (41) with the larger hole diameter faces the tapered sleeve (42).

3. The hand-held hydraulic tapered sleeve connecting pliers according to claim 1, characterized in that, The double-headed hydraulic cylinder (8) includes a cylinder (81) installed vertically in the oil tank (7) and piston rods (82) inserted vertically at both ends of the cylinder (81). The piston rod (82) is provided with a piston adapted to the inner wall of the cylinder (81) at one end inside the cylinder (81).

4. The hand-held hydraulic tapered sleeve connecting pliers according to claim 3, characterized in that, The fluid guiding structure includes a second conduit (83) installed between the cylinder (81) and the oil storage chamber (71) and a pressure relief valve (11) installed in the second conduit (83), the pressure relief valve (11) extending to the outside of the oil tank (7) on the side opposite to the second conduit (83).

5. The hand-held hydraulic tapered sleeve connecting pliers according to claim 1, characterized in that, The pawl component (3) includes a fixed pawl (31) fixedly installed on the reversing support (2) near the cone sleeve adjusting head (4), a rotating pawl (32) rotatably installed on the reversing support (2) near the cone sleeve adjusting head (4), and a stop block (33) rotatably installed in the fixed pawl (31) and the rotating pawl (32). The rotation axis of the stop block (33) in the fixed pawl (31) and the rotating pawl (32) is horizontally arranged. The stop block (33) is triangular, and one side of the triangle faces the cone sleeve adjusting head (4).

6. The hand-held hydraulic tapered sleeve connecting pliers according to claim 1, characterized in that, A handle (10) is installed on one side of the connector (5) in the width direction.

7. The hand-held hydraulic tapered sleeve connecting pliers according to claim 3, characterized in that, The drive assembly includes a hydraulic pump (6) mounted on the outer wall of the oil tank (7), a pressure rod (1) hinged to the hydraulic pump (6), a connecting rod (19) hinged to the outer wall of the oil tank (7) and hinged to the pressure rod (1), and a first conduit (61) mounted on the bottom of the housing of the hydraulic pump (6) and communicating with the oil storage cavity (71). A second check valve is provided in the first conduit (61), and a first check valve is provided on the side of the hydraulic pump (6) near the oil tank (7). The end of the first check valve away from the hydraulic pump (6) passes through the outer wall of the oil tank (7) and communicates with the cylinder (81).

8. The hand-held hydraulic tapered sleeve connecting pliers according to claim 7, characterized in that, Both the upper and lower sides of the oil tank (7) are equipped with elastic elements (13) that are connected to the reversing support (2).

9. The hand-held hydraulic tapered sleeve connecting pliers according to claim 3, characterized in that, The drive assembly includes a gear pump (16) and a drive unit (15) mounted on the outer wall of the oil tank (7), and a third conduit (18) mounted on the input end of the gear pump (16) and communicating with the oil storage chamber (71); the drive shaft of the drive unit (15) is fixedly connected to the drive wheel in the gear pump (16), and the output end of the gear pump (16) is communicating with the cylinder (81).

10. The hand-held hydraulic tapered sleeve connecting pliers according to claim 9, characterized in that, A battery (17) is fixedly installed on the outer wall of the fuel tank (7). The drive unit (15) is electrically connected to the battery (17). A handle (14) is fixedly installed on the side of the fuel tank (7) away from the connector (5). A switch (141) for controlling the operation of the drive unit (15) is provided on the handle (14).

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