CN111005377B

CN111005377B - Drilling tool supporting limiting descending device for bored pile construction

Info

Publication number: CN111005377B
Application number: CN201911371485.4A
Authority: CN
Inventors: 安继茂
Original assignee: Heilongjiang Bada Road And Bridge Construction Co ltd
Current assignee: Heilongjiang Bada Road And Bridge Construction Co ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2021-07-27
Anticipated expiration: 2039-12-26
Also published as: CN111005377A

Abstract

The invention discloses a drilling tool supporting limiting descending device for drilling pile construction, which comprises a lifting mechanism, an extension mechanism and a locking mechanism, wherein the extension mechanism is arranged in the lifting mechanism, the extension mechanism is provided with a plurality of locking mechanisms, the lifting mechanism comprises a cover frame, an extension plate, trundles, slots, limiting plates, transverse plates, a lifting cylinder, a toothed plate, a bearing plate, a speed reducer, a first motor, a rotating shaft and a toothed column, the outer edge of the cover frame is fixedly connected with the extension plate, the lower side of the extension plate is provided with a plurality of trundles, and the middle part of the cover frame is sleeved with the lifting cylinder, the tooth posts are installed on two sides of the slot of the cover frame, the lifting cylinder is arranged between the tooth posts, the tooth plates on the lifting cylinder are meshed and transmitted through the tooth posts driven by the motor, the height of the positioning cylinder can be adjusted, the positioning cylinder can be conveniently placed into the pile slot, and the insertion cylinder on the lower expansion plate can prevent the cover frame from moving on the horizontal position.

Description

Drilling tool supporting limiting descending device for bored pile construction

Technical Field

The invention relates to a drilling tool supporting limiting descending device, in particular to a drilling tool supporting limiting descending device for drilling pile construction, and belongs to the field of drilling pile construction.

Background

The cast-in-situ bored pile is produced by means of mechanical drilling, steel pipe extruding, manual digging, etc. in the engineering site to form pile hole, setting reinforcing cage and concrete pouring to form pile, and may be classified into immersed tube cast-in-situ pile, cast-in-situ bored pile and cast-in-situ bored pile, etc. during drilling, if the foundation with drilling machine is unstable, the drilling machine will tilt, incline, eccentric pile and other bad influence will occur during construction, so that the foundation may be installed stably, soft and sloping foundation may be leveled with bulldozer, reinforced with steel plate or sleeper, and this makes it important to determine the central position and install drilling machine correctly, and for the drilling machine with drilling tower, the drilling machine is first matched with the nearby ground cage to position the drilling rod and the frame is jacked with jack, and (3) accurately positioning, enabling a clamping hole of a hoisting pulley, a drill bit or a fixed drill rod to be on a vertical line with the center of the protective cylinder so as to ensure the verticality of the drilling machine, enabling the deviation of the position of the drilling machine to be not more than 2cm, after the drilling machine is aligned with a pile position, using a sleeper to flat the cross beam of the drilling machine, and pulling a guy rope on the tower top symmetrically to the axis of the drilling machine.

According to the above content, at present, the installation of drilling machine needs the manual work to be played the stake basis firmly earlier, and needs progressively to realize above-mentioned operation one by one, has wasted more manpower and materials, and it is spacing to urgently need an integral type pile driving equipment to support drilling machinery.

Disclosure of Invention

The invention aims to solve the defects that in the prior art, the drilling machine needs to firmly drill a pile foundation manually and needs to gradually realize the operation step by step, and more manpower and material resources are wasted.

In order to achieve the purpose, the invention adopts the following technical scheme:

the drilling tool supporting limiting descending device for the bored pile construction comprises a lifting mechanism, an extension mechanism and a lock insertion mechanism, wherein the extension mechanism is arranged inside the lifting mechanism, and a plurality of lock insertion mechanisms are arranged on the extension mechanism.

Preferably, the lifting mechanism comprises a cover frame, an extension plate, casters, slots, a limiting plate, transverse plates, a lifting cylinder, a toothed plate, bearing plates, a speed reducer, a motor, a rotating shaft and a toothed column, the outer edge of the cover frame is fixedly connected with the extension plate, a plurality of casters are installed on the lower side of the extension plate, the middle of the cover frame is sleeved with the lifting cylinder, the upper side edge of the lifting cylinder is fixedly connected with the limiting plate, the upper side of the limiting plate is fixedly connected with the transverse plates, the toothed plates are fixedly connected with both sides of the lifting cylinder, two bearing plates are screwed on both sides of the lifting cylinder and the lower side of the cover frame, the rotating shaft is arranged between the adjacent bearing plates, both ends of the rotating shaft are rotatably connected with the bearing plates through bearings, one of the bearing plates is screwed with the speed reducer, one of the speed reducer is screwed on one side, the output shaft of the first motor is fixedly connected with the input shaft of the speed reducer, the output shaft of the speed reducer penetrates through the bearing plate to be fixedly connected with the rotating shaft, and the outer side of the middle of the rotating shaft is fixedly sleeved with the tooth columns.

Preferably, the extension mechanism comprises an upper display plate, a lower display plate, a motor II, a positioning barrel, a rotating rod, an external thread, a sliding plate, a screw hole, a rotating pin, an inclined rod, a clamping plate, a hinge seat, a pressing plate and an inserting barrel, wherein the upper display plate is fixedly connected at the bottom port of the lifting barrel, the lower display plate is arranged below the upper display plate, the positioning barrel is fixedly connected between the lower display plate and the upper display plate, four rotating rods are arranged between the lower display plate and the upper display plate and correspond to four side walls of the positioning barrel, two ends of each rotating rod are rotatably connected with the lower display plate and the upper display plate through bearings, the external thread is respectively arranged on the outer walls of two ends of each rotating rod, the sliding plate is respectively sleeved on the outer side of the external thread, the screw hole is respectively arranged in the middle of the sliding plate, the clamping plate is respectively fixedly connected on one side of two ends of the sliding plate, the rotating pin is respectively fixedly connected on the corresponding inner wall of the adjacent clamping plate, the inclined rod is respectively sleeved on the outer side of the rotating pin, four sides of a location section of thick bamboo should have four clamp plates, all fixed the inlaying is equipped with a plurality of sections of inserting on clamp plate and the lower panel, the clamp plate is close four free bearings of the equal fixedly connected with in one side of a location section of thick bamboo, the free bearing is articulated with adjacent down tube respectively, the upside screw fixation of going up the panel has four No. two motors, the output shaft of No. two motors all passes panel and adjacent bull stick fixed connection.

Preferably, the lock is inserted the mechanism and is included No. three motors, barrel groove, slide opening, inserted bar, spring, arc, round bar and rotor, the barrel groove is all seted up in inserting a section of thick bamboo, the equal screw fixation of No. three motors is on a side end face of inserting a section of thick bamboo, the symmetry has a plurality of slide openings on the cell wall of barrel groove, all inlay in the slide opening and be equipped with the inserted bar, the output shaft of No. three motors all passes and inserts a fixedly connected with round bar, the equal fixed cover in the outside of round bar is equipped with the rotor, the both sides of rotor just are located and insert a section of thick bamboo and all are equipped with the arc, the arc all with adjacent inserted bar fixed connection, the outside that just is located the inserted bar between arc and the barrel groove cell wall all overlaps and is equipped with the spring.

Preferably, a lifting cylinder is arranged between the two tooth columns, the two tooth columns are respectively meshed with the adjacent toothed plates, a plurality of through holes are formed in the transverse plate, and the cross section of the cover frame is of an isosceles trapezoid structure.

Preferably, the adjacent screw thread directions of the external screw threads are opposite, the structure of the screw hole is matched with the structure of the external screw threads, and the sliding plate is connected with the outer wall of the positioning barrel in a sliding mode.

Preferably, the both sides symmetry of rotor is equipped with the sand grip, inserted bar and sliding hole inner wall sliding connection.

The drilling tool supporting limiting descending device for the bored pile construction has the advantages that:

(1) according to the drilling tool supporting limiting descending device for the bored pile construction, the tooth columns are arranged on two sides of the slot of the cover frame, the lifting cylinder is arranged between the tooth columns, the tooth columns are driven by the motor to be meshed with the toothed plates on the lifting cylinder, so that the height of the positioning cylinder can be adjusted, the positioning cylinder can be conveniently placed in the pile slot, and the inserting cylinder on the lower expansion plate can prevent the cover frame from displacing on the horizontal position.

(2) According to the drilling tool supporting limiting descending device for the bored pile construction, the rotating rods are arranged in four directions of the positioning barrel respectively, the two sliding plates are sleeved on the rotating rods, the second motor drives the rotating rods to rotate, the adjacent sliding plates can be driven to be away from or close to each other through threads, the pressing plates are convenient to cling to the inner wall of the pile groove, and the inserting barrel on the pressing plates can prevent the cover frame from moving in the vertical direction.

(3) According to the drilling tool supporting limiting descending device for the bored pile construction, the oblate rotors are arranged in the inserting cylinders, the arc plates are arranged on the two sides of the rotors, the inserting rods are arranged on the side faces, away from each other, of the arc plates, when the angle of the rotors is changed, the arc plates can be pushed away from each other, the inserting rods are further pushed out of the sliding holes, the ground grabbing force of the inserting cylinders and a pile foundation can be effectively improved, therefore, the cover frame and the ground are effectively fixed into a whole, the problem that a limiting structure shakes violently when drilling and excavating equipment runs can be solved, the drilling tool supporting limiting descending device is quick to move and convenient to install, and a large amount of manpower and material resources are saved.

Drawings

Fig. 1 is a structural sectional view of a drilling tool supporting limiting descending device for bored pile construction according to the present invention;

FIG. 2 is a structural sectional view along the A-A direction in FIG. 1 of a drilling tool supporting limiting descending device for bored pile construction according to the present invention;

FIG. 3 is a structural sectional view of a lifting mechanism in the drilling tool supporting limiting descending device for bored pile construction according to the present invention;

fig. 4 is a schematic perspective view of a tooth column in the drilling tool supporting limiting descending device for bored pile construction according to the present invention;

fig. 5 is a structural sectional view of an insertion cylinder in the drilling tool supporting limiting descending device for bored pile construction according to the present invention.

In the figure: the lifting mechanism 1, the cover frame 11, the extension plate 12, the caster 13, the slot 14, the limit plate 15, the horizontal plate 16, the lifting cylinder 17, the toothed plate 18, the bearing plate 19, the speed reducer 110, the first motor 111, the rotating shaft 112, the toothed column 113, the extension mechanism 2, the upper display plate 21, the lower display plate 22, the second motor 23, the positioning cylinder 24, the rotating rod 25, the external thread 26, the sliding plate 27, the screw hole 28, the first rotating pin 29, the inclined rod 210, the clamping plate 211, the hinge base 212, the pressing plate 213, the inserting cylinder 214, the locking and inserting mechanism 3, the third motor 31, the cylinder groove 32, the sliding hole 33, the inserting rod 34, the spring 35, the arc plate 36, the round rod 37 and the rotor 38.

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.

Referring to fig. 1-5, a drilling tool supporting limiting descending device for bored pile construction comprises a lifting mechanism 1, an extension mechanism 2 and a locking mechanism 3, wherein the extension mechanism 2 is installed inside the lifting mechanism 1, and the extension mechanism 2 is provided with a plurality of locking mechanisms 3.

Wherein, the lifting mechanism 1 comprises a cover frame 11, an extension plate 12, trundles 13, slots 14, a limit plate 15, a transverse plate 16, a lifting cylinder 17, a toothed plate 18, bearing plates 19, a speed reducer 110, a motor 111, a rotating shaft 112 and toothed columns 113, the outer edge of the cover frame 11 is fixedly connected with the extension plate 12, the lower side of the extension plate 12 is provided with a plurality of trundles 13, the middle part of the cover frame 11 is sleeved with the lifting cylinder 17, the upper side edge of the lifting cylinder 17 is fixedly connected with the limit plate 15, the upper side of the limit plate 15 is fixedly connected with the transverse plates 16, both sides of the lifting cylinder 17 are fixedly connected with the toothed plates 18, both sides of the lifting cylinder 17 and positioned at the lower side of the cover frame 11 are respectively fixed with two bearing plates 19 by screws, the rotating shaft 112 is arranged between the adjacent bearing plates 19, both ends of the rotating shaft 112 are respectively rotatably connected with the bearing plates 19 by bearings, one of the bearing plate 19 is fixed with the speed reducer 110, one of the bearing plates 19 is fixed with the motor 111, an output shaft of the first motor 111 is fixedly connected with an input shaft of the speed reducer 110, the output shaft of the speed reducer 110 penetrates through the bearing plate 19 to be fixedly connected with the rotating shaft 112, and the outer side of the middle of the rotating shaft 112 is fixedly sleeved with the tooth post 113.

Wherein, the extension mechanism 2 comprises an upper display plate 21, a lower display plate 22, a second motor 23, a positioning cylinder 24, a rotating rod 25, an external thread 26, a sliding plate 27, a screw hole 28, a first rotating pin 29, an inclined rod 210, a clamping plate 211, a hinge seat 212, a pressing plate 213 and an inserting cylinder 214, the upper display plate 21 is fixedly connected with the bottom port of the lifting cylinder 17, the lower display plate 22 is arranged below the upper display plate 21, the positioning cylinder 24 is fixedly connected between the lower display plate 22 and the upper display plate 21, four rotating rods 25 are arranged between the lower display plate 22 and the upper display plate 21 and corresponding to the four side walls of the positioning cylinder 24, two ends of each rotating rod 25 are rotatably connected with the lower display plate 22 and the upper display plate 21 through bearings, the external thread 26 is respectively arranged on the outer walls of two ends of the rotating rods 25, the sliding plate 27 is respectively sleeved on the outer sides of the external thread 26, the screw hole 28 is respectively arranged in the middle of the sliding plate 27, one side of two ends of the sliding plate 211 is respectively fixedly connected with the clamping plate 211, the first rotating pin 29 is respectively fixedly connected on the opposite inner walls of the adjacent clamping plate 211, the outer side of the first rotating pin 29 is sleeved with an inclined rod 210, four side faces of the positioning cylinder 24 are correspondingly provided with four pressing plates 213, the pressing plates 213 and the lower display plate 22 are fixedly embedded with a plurality of inserting cylinders 214, the pressing plates 213 are close to one side of the positioning cylinder 24 and are fixedly connected with four hinged supports 212, the hinged supports 212 are hinged to the adjacent inclined rods 210 respectively, the upper side screws of the upper display plate 21 are fixed with four motors 23, and output shafts of the motors 23 penetrate through the upper display plate 21 and the adjacent rotating rods 25.

Wherein, the mechanism 3 is inserted to the lock includes No. three motor 31, a barrel groove 32, the slide opening 33, inserted bar 34, spring 35, arc 36, round bar 37 and rotor 38, barrel groove 32 is all seted up in inserting a section of thick bamboo 214, the equal screw fixation of No. three motor 31 is on a side end face of inserting a section of thick bamboo 214, the symmetry has a plurality of slide openings 33 on the cell wall of barrel groove 32, all inlay in the slide opening 33 and be equipped with inserted bar 34, the output shaft of No. three motor 31 all passes inserting a section of thick bamboo 214 fixedly connected with round bar 37, the equal fixed cover in outside of round bar 37 is equipped with rotor 38, rotor 38's both sides just are located inserting a section of thick bamboo 214 and all are equipped with arc 36, arc 36 all with adjacent inserted bar 34 fixed connection, the outside that just is located inserted bar 34 between arc 36 and the barrel groove 32 cell wall is equipped with spring 35.

Wherein, be equipped with a lift section of thick bamboo 17 between two tooth posts 113, two tooth posts 113 are connected with adjacent pinion rack 18 meshing respectively, have seted up a plurality of perforation on the diaphragm 16, and the cross-section of cover frame 11 is isosceles trapezoid structure, starts motor 111, drives pivot 112 and rotates, and then the tooth post 113 antiport of a drive lift section of thick bamboo 17 both sides, can mesh and transmit a lift section of thick bamboo 17 downstream, insert a section of thick bamboo 214 and insert the stake groove bottom completely until lower panel 22 downside.

Wherein, the screw thread direction of adjacent external screw thread 26 is opposite, the structure of screw 28 and the structure looks adaptation of external screw thread 26, slide 27 and location section of thick bamboo 24 outer wall sliding connection, the rotation of bull stick 25, opposite external screw thread 26 structure on same bull stick 25 can two slide 27 of screw drive be close to each other, and then change the contained angle between two down tubes 210, and then promote the clamp plate 213 by free bearing 212 and keep away from a location section of thick bamboo 24.

The convex strips are symmetrically arranged on two sides of the rotor 38, the inserting rods 34 are connected with the inner wall of the sliding hole 33 in a sliding mode, the third motor 31 is started, the output shaft of the third motor 31 is controlled to rotate 90 degrees, the rotor 38 can extrude the two arc-shaped plates 36 to be away from each other, the spring 35 is in a compression state, the inserting rods 34 guide the sliding holes 33 out to be inserted into a soil layer to stretch out, the ground grabbing force of the inserting barrel 214 can be effectively increased, and the normal operation of drilling equipment is guaranteed.

The working principle is as follows: drilling equipment for drilling pile construction is fixed on a transverse plate 16 through screws, square pile grooves are firstly dug on the upper side of a reserved drilling opening, then a cover frame 11 is horizontally moved and pushed to be right above the pile grooves, a first motor 111 is started to drive a rotating shaft 112 to rotate, so that tooth posts 113 on two sides of a lifting cylinder 17 are driven to rotate reversely, the lifting cylinder 17 can be meshed and transmitted to move downwards until an insertion cylinder 214 on the lower side of a lower display plate 22 is completely inserted into the bottom of the pile grooves, the cover frame 11 and a positioning cylinder 24 can be effectively limited, so that the cover frame 11 and the positioning cylinder 24 cannot displace in the horizontal direction, then a second motor 23 is started, a rotating rod 25 rotates automatically, opposite external threads 26 structures on the same rotating rod 25 can drive two sliding plates 27 to approach each other through threads, an included angle between two inclined rods 210 is changed, a pressing plate 213 is further pushed to be far away from the positioning cylinder 24 through a hinged support 212, so that the insertion cylinder 214 on the pressing plate 213 is completely inserted into the side walls of the pile grooves, make cover frame 11 and a location section of thick bamboo 24 can not take place the ascending displacement of vertical direction, can avoid boring the drawback that equipment operation can lead to the excessive vibration of system, and is further, open No. three motor 31, the output shaft of control No. three motor 31 rotates 90 degrees, rotor 38 can extrude two arcs 36 and keep away from each other, spring 35 is then in compression state, inserted bar 34 then derives slide opening 33 and inserts the soil layer and stretch out, can effectively increase the land fertility of grabbing of an inserted section of thick bamboo 214, guarantee to bore the equipment normal operating, and the same is equitable, reverse operation above step, can be with in the cover frame 11 of retracting again location section of thick bamboo 24, at this moment, cover frame 11 promotes to next stake groove upside can.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A drilling tool supporting limiting descending device for bored pile construction is characterized by comprising a lifting mechanism (1), an extension mechanism (2) and a locking and inserting mechanism (3), wherein the extension mechanism (2) is installed inside the lifting mechanism (1), and a plurality of locking and inserting mechanisms (3) are installed on the extension mechanism (2);

the lifting mechanism (1) comprises a cover frame (11), an extension plate (12), trundles (13), slots (14), limiting plates (15), transverse plates (16), a lifting cylinder (17), toothed plates (18), bearing plates (19), a speed reducer (110), a first motor (111), a rotating shaft (112) and toothed columns (113), wherein the outer edge of the cover frame (11) is fixedly connected with the extension plate (12), a plurality of trundles (13) are installed on the lower side of the extension plate (12), the middle of the cover frame (11) is sleeved with the lifting cylinder (17), the upper side edge of the lifting cylinder (17) is fixedly connected with a limiting plate (15), a plurality of transverse plates (16) are fixedly connected with the upper side of the limiting plate (15), the toothed plates (18) are fixedly connected with the two sides of the lifting cylinder (17), and the two bearing plates (19) are fixed with screws on the two sides of the lifting cylinder (17) and the lower side of the cover frame (11), a rotating shaft (112) is arranged between every two adjacent bearing plates (19), two ends of the rotating shaft (112) are rotatably connected with the bearing plates (19) through bearings, a speed reducer (110) is fixed on one of the bearing plates (19) through screws, a first motor (111) is fixed on one side of the speed reducer (110) through screws, an output shaft of the first motor (111) is fixedly connected with an input shaft of the speed reducer (110), an output shaft of the speed reducer (110) penetrates through the bearing plates (19) to be fixedly connected with the rotating shaft (112), and tooth columns (113) are fixedly sleeved on the outer side of the middle of the rotating shaft (112);

the extension mechanism (2) comprises an upper display plate (21), a lower display plate (22), a second motor (23), a positioning cylinder (24), a rotating rod (25), an external thread (26), a sliding plate (27), a screw hole (28), a rotating pin (29), an inclined rod (210), a clamping plate (211), a hinge seat (212), a pressing plate (213) and an inserting cylinder (214), wherein the upper display plate (21) is fixedly connected with the bottom end opening of the lifting cylinder (17), the lower display plate (22) is arranged below the upper display plate (21), the positioning cylinder (24) is fixedly connected between the lower display plate (22) and the upper display plate (21), four rotating rods (25) are arranged between the lower display plate (22) and the upper display plate (21) and correspond to four side walls of the positioning cylinder (24), two ends of each rotating rod (25) are rotatably connected with the lower display plate (22) and the upper display plate (21) through bearings, and external threads (26) are arranged on the outer walls of two ends of each rotating rod (25), sliding plates (27) are sleeved on the outer sides of the external threads (26), screw holes (28) are formed in the middle of each sliding plate (27), one side of each of two ends of the sliding plate (27) is fixedly connected with a clamping plate (211), the opposite inner walls of the adjacent clamping plates (211) are fixedly connected with a first rotating pin (29), the outer sides of the first rotating pins (29) are respectively sleeved with an inclined rod (210), four side surfaces of the positioning cylinder (24) are correspondingly provided with four pressing plates (213), a plurality of inserting cylinders (214) are fixedly embedded on the pressing plate (213) and the lower unfolding plate (22), one side of the pressure plate (213) close to the positioning cylinder (24) is fixedly connected with four hinged supports (212), the hinged support (212) is respectively hinged with the adjacent inclined rods (210), four second motors (23) are fixed on the upper side of the upper display plate (21) through screws, the output shafts of the second motors (23) penetrate through the upper display plate (21) and are fixedly connected with the adjacent rotating rods (25);

the lock inserting mechanism (3) comprises a third motor (31), a barrel groove (32), sliding holes (33), inserting rods (34), springs (35), arc-shaped plates (36), round rods (37) and rotors (38), wherein the barrel groove (32) is formed in an inserting barrel (214), the third motor (31) is fixed on one side end face of the inserting barrel (214) through screws, a plurality of sliding holes (33) are symmetrically formed in the wall of the barrel groove (32), the inserting rods (34) are embedded in the sliding holes (33), the output shaft of the third motor (31) penetrates through the inserting barrel (214) and is fixedly connected with the round rods (37), the rotors (38) are fixedly sleeved on the outer sides of the round rods (37), the arc-shaped plates (36) are arranged on the two sides of the rotors (38), the arc-shaped plates (36) are located in the inserting barrel (214), and the arc-shaped plates (36) are fixedly connected with the adjacent inserting rods (34), and springs (35) are sleeved between the arc-shaped plate (36) and the wall of the cylinder groove (32) and on the outer side of the inserted bar (34).

2. The drilling tool supporting, limiting and descending device for the bored pile construction according to claim 1, wherein a lifting cylinder (17) is arranged between the two tooth columns (113), the two tooth columns (113) are respectively engaged and connected with the adjacent toothed plates (18), the transverse plate (16) is provided with a plurality of through holes, and the cross section of the cover frame (11) is in an isosceles trapezoid structure.

3. The drill tool supporting and limiting descending device for bored pile construction according to claim 1, wherein the thread directions of the adjacent external threads (26) are opposite, the structure of the screw hole (28) is matched with the structure of the external threads (26), and the sliding plate (27) is connected with the outer wall of the positioning barrel (24) in a sliding manner.

4. The drill tool supporting, limiting and descending device for bored pile construction according to claim 1, wherein the rotor (38) is symmetrically provided with raised strips on both sides, and the insertion rod (34) is slidably connected with the inner wall of the slide hole (33).