CN210868807U

CN210868807U - Lotus seedpod picking device

Info

Publication number: CN210868807U
Application number: CN201921506628.3U
Authority: CN
Inventors: 颜俊杰; 付宗国; 周中华; 申超男; 盛杰; 王稙鑫; 范俊杰
Original assignee: Zhejiang Ocean University ZJOU
Current assignee: Zhejiang Ocean University ZJOU
Priority date: 2019-09-10
Filing date: 2019-09-10
Publication date: 2020-06-30
Anticipated expiration: 2029-09-10

Abstract

The utility model belongs to the technical field of the seedpod of lotus is picked, a device is picked to seedpod of lotus is related to. The utility model comprises a frame, an operating rod is arranged on the frame through a sliding mechanism, and a shell is fixedly arranged at the front end of the operating rod; a telescopic arm is arranged in the shell in a sliding manner and is connected with a telescopic piece of a telescopic driving mechanism arranged in the shell; a furling cutter head is fixedly arranged at the end part of the telescopic arm, and a furling cutter groove with a bending structure formed towards one side of the telescopic arm is formed in the furling cutter head; the front end of the shell is provided with a fixed cutter head with a forward cutting edge, and the fixed cutter head and the furled cutter head form a shear opening; there is collection frame fixed tool bit below the utility model has the advantages that: effectively improving the lotus seedpod picking efficiency.

Description

Lotus seedpod picking device

Technical Field

The utility model belongs to the technical field of the seedpod of lotus is picked, a device is picked to seedpod of lotus is related to.

Background

The lotus seeds have the effects of cooling and relieving summer-heat, nourishing the heart and soothing the nerves, are distributed in the north and south of China and even in south east Asia, and are particularly common in the south lotus seeds. At present, the lotus seedpod is usually picked by adopting a sickle or a bamboo pole which is tied with a steel ring and provided with a fishing net and the like. When the sickle is used, the length of the sickle is limited, so that a picker must take a fishing boat to continuously move when the sickle is used, and the working efficiency is not high. In the picking process of binding a steel ring with a bamboo pole and carrying a fishing net, a picker usually stands on the bank, the bamboo pole drives the steel ring to pull and cut off the rhizome of the lotus seedpod, the lotus seedpod falls into the fishing net, and the lotus seedpod stem is longer, so that component force is applied to the pulled stem and leaf in the lotus seedpod picking process, and the labor intensity of the method is high. In addition, as the lotus pond has a wider area, the bamboo pole can not touch all places, and the lotus seedpod is easy to leave in the lotus seedpod picking mode.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problems in the prior art, and provides a lotus seedpod picking device, which aims to solve the technical problems that: how to improve the lotus seedpod picking efficiency.

The utility model discloses a following technical scheme realizes: a lotus seedpod picking apparatus comprising:

a frame;

the operating rod is installed on the rack through a sliding mechanism, and a shell is fixedly arranged at the front end of the operating rod; a telescopic arm is slidably arranged in the shell and is connected with a telescopic piece of a telescopic driving mechanism arranged in the shell; the end part of the telescopic arm is fixedly provided with at least one furling cutter head, and a furling cutter groove with a bending structure formed towards one side of the telescopic arm is formed in the furling cutter head; the front end of the shell is provided with a fixed cutter head with a forward cutting edge, and a shear port is formed between the fixed cutter head and the furling cutter head;

collect the frame, collect the frame and be located fixed tool bit below.

In the lotus seedpod picking device, the outer side edge of the furling cutter head is provided with the fixed stop lever, and an obtuse included angle is formed between the stop lever and the furling cutter head.

In the lotus seedpod picking device, the end part of the telescopic arm is fixedly provided with the stop block.

In the lotus seedpod picking device, the front end of the shell is fixedly provided with the mounting frame, and the fixed cutter head is fixed at the front end of the mounting frame; a driving arm is arranged between the mounting frame and the stop block; one end of the driving arm is slidably mounted on the mounting frame, the other end of the driving arm is fixedly connected to the stop block, and the sliding direction of the driving arm is parallel to that of the telescopic arm; the mounting frame is vertically arranged and is rotatably connected with a pivot, a claw rod is arranged on the pivot, and the claw rod comprises a hinge rod and a swing rod; the outer end of the hinge rod is rotatably arranged on the pivot, and the inner end of the hinge rod is hinged to one sliding end of the driving arm; one end of the swing rod is fixedly connected to the outer end of the hinge rod, and the other end of the swing rod and the stop lever form an encircling structure.

In the lotus seed pod picking device, the bottom of the stop block is provided with the knife groove, one side of the knife groove penetrates through the side surface of the stop block facing the shell, and the length of the longitudinal section of the knife groove is greater than that of the fixed knife head; the length of the cross section of the cutter groove is larger than the width of the fixed cutter head.

In the lotus seedpod picking device, at least one accommodating groove is formed in the side face, facing the shell, of the stop block along the length direction, the lower end of the accommodating groove is communicated with the cutter groove, the accommodating groove is located right above the cutter groove, and the cross section of the accommodating groove is arc-shaped.

In the lotus seedpod picking device, one end of the driving arm is slidably arranged on the mounting frame through a sliding block slidably arranged on the mounting frame, and a connecting rod is arranged between the sliding block and the inner end of the hinged rod; one end of the connecting rod is hinged to the sliding block, and the other end of the connecting rod is hinged to the inner end of the hinged rod.

In the lotus seedpod picking device, the sliding mechanism is a control rod connecting sleeve, the control rod connecting sleeve is hinged to the rack, and a balancing weight is arranged on the control rod connecting sleeve.

In the lotus seedpod picking device, the telescopic driving mechanism is a cylinder, and the telescopic part is a piston rod of the cylinder; the cylinder body of the cylinder is hinged on the inner wall of the shell, and the piston rod of the cylinder is hinged on the end part of the telescopic arm extending into the shell; the air inlet end of the air cylinder is connected with the air outlet end of a compressor arranged on the frame, and the compressor is electrically connected with a power supply.

In the lotus seedpod picking device, the free end of the operating rod is fixedly provided with a handle, and the handle is provided with a control switch for controlling the extension and contraction of a piston rod of the air cylinder; the control switch is electrically connected with the air cylinder and the compressor through a power supply respectively.

Compared with the prior art, the lotus seedpod picking device has the following advantages:

1. the movement range of the telescopic arm is increased by operating the control lever, so that the movement of a picker is reduced; the lotus seed collecting knife groove is used for collecting and fixing lotus seed stems, and the lotus seed stems are positioned behind the lotus seed collecting knife groove, so that the structure is beneficial to cutting off the lotus seed stems by a shearing opening formed by the fixed knife head and the collected knife head, the picking efficiency of the lotus seeds is effectively improved, and the labor intensity is reduced. In addition, the device has simple structure and low cost.

2. When the telescopic arm is positioned below the shower, the cylinder drives the movable plate to move towards the shell. The telescopic arm drives the stop lever, so that the stop lever is contacted with the lotus seedpod stem. Along with the distance between the telescopic arm and the shell body is gradually reduced, the lotus seedpod stems enter the furling cutter groove along the length direction of the blocking rod. The structure is beneficial to the lotus seedpod stems to enter the tool closing groove, and the telescopic arm is convenient to fix the lotus seedpod stems.

3. In the process of folding the lotus seedpod stems by the embracing structure, the swinging rod drives the lotus seedpod stems near the folding tool bit to abut against the stop lever; along with the pin is close to fixed tool bit gradually, the swing arm is bigger and bigger around the pivoted angle, and the distance between swing arm and the pin is also littleer and more, and the lotus seedpod stem gets into in drawing in the sword groove along the length direction of pin under the swing arm drives. After the lotus seedpod stem is cut off, the telescopic driving mechanism drives the telescopic arm to extend out of the shell, the oscillating rod and the stop lever synchronously and reversely move, the oscillating rod rotates around the pivot, and the stop lever is far away from the fixed cutter head; at the moment, the swing rod and the stop rod are respectively positioned at two sides of the furling knife groove. The embracing structure obviously expands the range of furling the lotus seedpod stems, and automatically furls the lotus seedpod stems near the furling tool bit and fixes the lotus seedpod stems in the furling tool slot so as to conveniently cut off the lotus seedpod stems. This structure effectively improves the accuracy that this device is picked to seedpod of lotus snatchs the seedpod of lotus stem in the certain limit, effectively simplifies the step of picking the person's operation control pole, avoids picking the person because of complicated external environment unable location and cut off the seedpod of lotus stem and can't pick the seedpod of lotus.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is a sectional view of the structure at B-B in fig. 2.

In the figure, 1, a frame; 11. a control lever connecting sleeve; 12. a balancing weight; 2. a joystick; 21. a handle; 3. a housing; 4. a telescopic arm; 41. a cutter head is folded; 411. a cutter groove is closed; 412. closing the cutting edge; 42. a stop lever; 421. an included angle; 43. a stopper; 431. a cutter groove; 432. accommodating grooves; 5. a mounting frame; 51. fixing a cutter head; 6. a slider; 61. a claw rod; 611. a hinged lever; 612. a swing lever; 62. a pivot; 63. a connecting rod; 64. a drive arm; 7. a cylinder; 71. a control switch; 72. a compressor; 8. and (5) collecting the frame.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Referring to fig. 1 to 3, a lotus seedpod picking apparatus includes:

a frame 1;

the operating rod 2 is installed on the rack 1 through a sliding mechanism, and a shell 3 is fixedly arranged at the front end of the operating rod 2; a telescopic arm 4 is slidably arranged in the shell 3, and the telescopic arm 4 is connected with a telescopic piece of a telescopic driving mechanism arranged in the shell 3; a furling cutter head 41 is fixedly arranged on the end part of the telescopic arm 4, and a furling cutter groove 411 with a bending structure formed towards one side of the telescopic arm 4 is formed on the furling cutter head 41; a furling knife edge 412 is arranged on the inner side edge of the furling knife slot 411; the front end of the shell 3 is provided with a fixed cutter bit 51 with a forward cutting edge, and the fixed cutter bit 51 and the furling cutting edge 412 of the furling cutter bit 41 form a shear opening;

a collecting frame 8, wherein the collecting frame 8 is fixedly arranged on the lower side surface of the shell 3, and the collecting frame 8 is positioned below the fixed cutter head 51.

Frame 1 can vertically set firmly on the fishing boat, during using this device, through operation control rod 2, makes control rod 2 rotate on frame 1 through slide mechanism, and control rod 2 also can slide around on slide mechanism simultaneously to increase telescopic boom 4's home range. When the telescopic arm 4 moves below the lotus seedpod, the lotus seedpod stem enters the closing knife slot 411. At this time, the telescopic driving mechanism is started, the telescopic part drives the telescopic arm 4 to retract into the housing 3, the tool retracting groove 411 drives the lotus seed stems to approach towards the fixed tool bit 51, the distance between the fixed tool bit 51 and the lotus seed stems is gradually reduced, finally, the lotus seed stems are cut off by a shearing opening formed by the fixed tool bit 51 and the tool retracting blade 412, and the separated lotus seeds fall into the collecting frame 8 below under the action of gravity. Then, under the action of the telescopic driving mechanism, the telescopic arm 4 extends out of the housing 3, and the furling blade 412 and the furling knife slot 411 are far away from the fixed knife head 51.

In the process, the operating lever 2 is operated to increase the moving range of the telescopic arm 4 and reduce the movement of the picker; the lotus seed collecting knife slot 411 is used for collecting and fixing lotus seed stems, and the lotus seed stems are positioned behind the lotus seed collecting knife slot 411, so that the structure is beneficial to cutting off the lotus seed stems by a shearing opening formed by the fixed knife head 51 and the collected knife head 41, the picking efficiency of the lotus seeds is effectively improved, and the labor intensity is reduced. In addition, the device has simple structure and low cost.

Referring to fig. 3, specifically, the outside edge of the furling bit 41 is provided with a fixed stop lever 42, and an included angle 421 forming an obtuse angle is formed between the stop lever 42 and the furling bit 41. Preferably, the included angle 421 is 145 degrees.

When the telescopic arm 4 is positioned below the shower rose, the telescopic driving mechanism is started. The telescopic member drives the telescopic arm 4 to retract into the housing 3. The telescopic arm 4 drives the stop lever 42 to make the stop lever 42 contact with the lotus seedpod stem. As the distance between the telescopic arm 4 and the housing 3 is gradually reduced, the lotus seedpod enters the converging cutter slot 411 along the length direction of the stop rod 42.

This structure plays the guide effect, helps the lotus seedpod stem to get into in drawing in the sword groove 411, and the range that the sword groove 411 is used for drawing in, fixed lotus seedpod stem is effectively enlarged to pin 42 simultaneously to reduce the degree of difficulty that the picker operated lever 2.

Referring to fig. 2 and 3, in detail, a stopper 43 is fixed on the end of the telescopic arm 4, and both the stopper 43 and the fixed cutter head 51 are located above the telescopic arm 4.

When the lotus seedpod enters the retracting slot 411, the lotus seedpod will contact the stopper 43 and abut against the stopper 43 as the retracting bit 41 approaches the fixed bit 51. In the process of cutting off the lotus seedpod stem at the shear port formed by the fixed cutter head 51 and the furling cutter head 41, the stop block 43 effectively plays a role of stabilizing the lotus seedpod stem, thereby improving the working efficiency of cutting off the lotus seedpod stem. The separated rosette is also pressed by the stop 43, so that it falls more easily into the collecting frame 8.

Referring to fig. 2 and 3, specifically, a U-shaped mounting bracket 5 is further fixedly arranged at the front end of the housing 3, and a bottom plate of the mounting bracket 5 is fixed at the front end of the housing 3; the fixed cutter head 51 is fixed at the front end of the mounting frame 5; a driving arm 64 is arranged between the mounting frame 5 and the stop block 43; one end of the driving arm 64 is slidably mounted on the mounting frame 5, the other end of the driving arm 64 is fixedly connected to the stop block 43, and the sliding direction of the driving arm 64 is parallel to that of the telescopic arm 4; a pivot 62 is vertically arranged and rotatably connected to the mounting frame 5, a claw rod 61 is arranged on the pivot 62, and the claw rod 61 comprises a hinge rod 611 and a swinging rod 612; the outer end of the hinge rod 611 is rotatably arranged on the pivot 62, and the inner end is hinged on the sliding end of the driving arm 64; one end of the swing rod 612 is fixedly connected to the outer end of the hinge rod 611, and the other end of the swing rod 612 forms an embracing structure with the stop lever 42.

Under the action of the telescopic driving mechanism, the telescopic arm 4 retracts into the housing 3, and the stop 43 and the stop rod 42 are gradually close to the fixed cutter head 51 and the mounting frame 5. Meanwhile, the stopper 43 also drives the driving arm 64, and the sliding end of the driving arm 64 drives the hinge rod 611 to rotate around the pivot 62; and the hinge rod 611 brings one end of the swing lever 612 out of the mounting frame 5 and approaches the end toward the stopper 42. Thus, the swing rod 612 and the stop lever 42 move synchronously to form a clasping structure.

In the process of folding the lotus seedpod stem, the swing rod 612 drives the lotus seedpod stem near the folding cutter head 41 to abut against the stop rod 42; as the blocking rod 42 gets closer to the fixed cutter head 51, the angle of rotation of the swing rod 612 about the pivot 62 becomes larger, the distance between the swing rod 612 and the blocking rod 42 becomes smaller, and the lotus stalks enter the converging cutter slot 411 along the length direction of the blocking rod 42 under the driving of the swing rod 612. After the lotus seedpod is cut off, the telescopic driving mechanism drives the telescopic arm 4 to extend out of the shell 3, the swing rod 612 and the stop lever 42 synchronously and reversely move, the swing rod 612 rotates around the pivot 62, and the stop lever 42 is far away from the fixed cutter head 51; at this time, the swing lever 612 and the stopper lever 42 are respectively located at both sides of the converging knife slot 411.

The embracing structure can remarkably expand the range of furling the lotus seedpod stems, and automatically furls the lotus seedpod stems near the furling cutter head 41 and fixes the lotus seedpod stems in the furling cutter slot 411 so as to conveniently cut off the lotus seedpod stems. This structure effectively improves the accuracy that this device is picked to seedpod of lotus snatchs the seedpod of lotus stem in the certain limit, effectively simplifies the step of picker operation control rod 2, avoids picker can't pinpoint and cut off the seedpod of lotus stem and can't pick the seedpod of lotus because of complicated external environment.

Referring to fig. 2 and 3, specifically, a knife groove 431 is formed in the bottom of the stopper 43, one side of the knife groove 431 penetrates through the side surface of the stopper 43 facing the housing 3, and the longitudinal section length of the knife groove 431 is greater than that of the fixed cutter head 51; the length of the cross section of the sipe 431 is greater than the width of the fixed blade 51.

During the cutting of the lotus seedpod stem by the fixed cutter head 51, the distance between the stopper 43 and the fixed cutter head 51 is gradually reduced until the fixed cutter head 51 cuts the lotus seedpod stem and enters the knife groove 431. The knife groove 431 is used for accommodating the fixed cutter head 51, and is helpful for the fixed cutter head 51 to completely cut off the lotus rhizome, so that the working efficiency of the fixed cutter head 51 is improved.

Referring to fig. 1, specifically, a receiving groove 432 is formed on a side surface of the stopper 43 facing the housing 3 along the length direction, a lower end of the receiving groove 432 is communicated with the knife groove 431, the receiving groove 432 is directly above the converging knife groove 411, and the cross section of the receiving groove 432 is arc-shaped.

When the lotus stem contacts the stopper 43, the lotus stem enters the receiving groove 432. The containing groove 432 with the arc-shaped cross section is beneficial to stabilizing the lotus stem, avoiding the lotus stem from shaking and improving the working efficiency of the fixed cutter head 51.

Referring to fig. 3, in detail, one end of the driving arm 64 is slidably disposed on the mounting frame 5 through a sliding block 6 slidably disposed on the mounting frame 5, and a connecting rod 63 is disposed between the sliding block 6 and the inner end of the hinge rod 611; the connecting rod 63 is hinged at one end to the sliding block 6 and at the other end to the inner end of the hinge bar 611.

The stop 43 carries the driving arm 64 during retraction and extension of the telescopic arm 4 into and out of the housing 3. One end of the driving arm 64 slides on the mounting frame 5 through the sliding block 6, and the sliding block 6 drives the connecting rod 63. The connecting rod 63 carries the hinge lever 611, causing the hinge lever 611 to rotate about the pivot 62, while the hinge lever 611 also carries the swing lever 612 to rotate about the pivot 62.

This structure effectively increases the angle of rotation of the claw lever 61 about the pivot 62.

Referring to fig. 1, specifically, the sliding mechanism is a joystick connecting sleeve 11, the joystick connecting sleeve 11 is hinged to the frame 1 through a universal joint, and a counterweight 12 is arranged on the joystick connecting sleeve 11.

The counterweight 12 balances the weight on both sides of the frame 1, facilitating the operation of the lever 2 by the picker.

Referring to fig. 1, specifically, the telescopic driving mechanism is a cylinder 7, and the telescopic member is a piston rod of the cylinder 7; the cylinder body of the cylinder 7 is hinged on the inner wall of the shell 3, and the piston rod of the cylinder 7 is hinged on the end part of the telescopic arm 4 extending into the shell 3. The air inlet end of the air cylinder 7 is connected with the air outlet end of a compressor 72 arranged on the frame 1, and the compressor 72 is electrically connected with a power supply.

When a piston rod of the air cylinder 7 extends, the telescopic arm 4 is gradually far away from the shell 3; when the piston rod of the cylinder 7 is shortened, the telescopic arm 4 is gradually close to the housing 3, and the process of cutting off the lotus seedpod stem by the fixed cutter head 51 is performed.

Referring to fig. 1, specifically, a handle 21 is fixedly arranged at a free end of the operating lever 2, and a control switch 71 for controlling the extension and contraction of a piston rod of the cylinder 7 is arranged on the handle 21. The control switch 71 is electrically connected to the cylinder 7 and the compressor 72 through a power source, respectively. Handle 21 facilitates the operation of lever 2 by the picker. In the process of operating the operating lever 2, the extension and the shortening of the piston rod of the air cylinder 7 are controlled by the control switch 71, and the process of cutting off the lotus seedpod stems by the fixed cutter head 51 is carried out, so that the labor intensity is reduced, and the working efficiency is improved.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A device is picked to seedpod of lotus, its characterized in that includes:

a frame (1);

the operating rod (2) is installed on the rack (1) through a sliding mechanism, and a shell (3) is fixedly arranged at the front end of the operating rod (2); a telescopic arm (4) is slidably arranged in the shell (3), and the telescopic arm (4) is connected with a telescopic piece of a telescopic driving mechanism arranged in the shell (3); at least one furling cutter head (41) is fixedly arranged at the end part of the telescopic arm (4), and a furling cutter groove (411) with a bending structure formed towards one side of the telescopic arm (4) is formed in the furling cutter head (41); a fixed cutter head (51) with a forward cutting edge is arranged at the front end of the shell (3), and a shear opening is formed between the fixed cutter head (51) and the furling cutter head (41);

and the collecting frame (8) is positioned below the fixed cutter head (51).

2. The lotus seedpod picking device as claimed in claim 1, wherein a stop lever (42) is fixed to the outer edge of the foldable cutter head (41), and an obtuse included angle (421) is formed between the stop lever (42) and the foldable cutter head (41).

3. A lotus seedpod picking apparatus as claimed in claim 2, in which the end of the telescopic arm (4) is fixed with a stop (43).

4. A lotus seedpod picking device as claimed in claim 3, wherein a mounting frame (5) is fixedly arranged at the front end of the housing (3), and the fixed cutter head (51) is fixed at the front end of the mounting frame (5); a driving arm (64) is arranged between the mounting rack (5) and the stop block (43); one end of the driving arm (64) is slidably mounted on the mounting frame (5), the other end of the driving arm is fixedly connected to the stop block (43), and the sliding direction of the driving arm (64) is parallel to that of the telescopic arm (4); the mounting rack (5) is vertically arranged and is rotatably connected with at least one pivot (62), a claw rod (61) is arranged on the pivot (62), and the claw rod (61) comprises a hinged rod (611) and a swinging rod (612); the outer end of the hinge rod (611) is rotatably arranged on the pivot (62), and the inner end of the hinge rod is hinged on one sliding end of the driving arm (64); one end of the swinging rod (612) is fixedly connected to the outer end of the hinged rod (611), and the other end of the swinging rod and the stop lever (42) form an embracing structure.

5. A lotus seedpod picking device as claimed in claim 4, wherein the bottom of the block (43) is provided with a knife groove (431), one side of the knife groove (431) penetrates through the side of the block (43) facing the housing (3), and the length of the longitudinal section of the knife groove (431) is greater than that of the fixed knife head (51); the length of the cross section of the knife groove (431) is larger than the width of the fixed knife head (51).

6. A lotus seedpod picking apparatus as claimed in claim 5, wherein the stopper (43) has at least one receiving groove (432) along its length on the side facing the housing (3), the lower end of the receiving groove (432) is connected to the knife groove (431), the receiving groove (432) is located right above the converging knife groove (411), and the cross section of the receiving groove (432) is arc-shaped.

7. A lotus seedpod picking apparatus as claimed in claim 4, wherein one end of the driving arm (64) is slidably mounted on the mounting frame (5) via a sliding block (6) slidably mounted on the mounting frame (5), and a connecting rod (63) is disposed between the sliding block (6) and the inner end of the hinge rod (611); one end of the connecting rod (63) is hinged on the sliding block (6), and the other end is hinged on the inner end of the hinge rod (611).

8. A lotus seedpod picking apparatus as claimed in claim 1, wherein the sliding mechanism is a lever connecting sleeve (11), the lever connecting sleeve (11) is hinged on the frame (1), and a weight block (12) is arranged on the lever connecting sleeve (11).

9. A lotus seedpod picking apparatus as claimed in claim 8, in which the telescopic driving mechanism is a cylinder (7), and the telescopic member is a piston rod of the cylinder (7); the cylinder body of the cylinder (7) is hinged on the inner wall of the shell (3), and the piston rod of the cylinder (7) is hinged on the end part of the telescopic arm (4) extending into the shell (3).

10. A lotus seedpod picking apparatus as claimed in claim 9, wherein a handle (21) is fixedly arranged at the free end of the operating rod (2), and a control switch (71) for controlling the extension and retraction of the piston rod of the cylinder (7) is arranged on the handle (21).