CN111775326A

CN111775326A - Concrete mixer based on dosing structure for construction

Info

Publication number: CN111775326A
Application number: CN202010765673.1A
Authority: CN
Inventors: 胡景琦
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-03
Filing date: 2020-08-03
Publication date: 2020-10-16

Abstract

The invention relates to the technical field of building construction, in particular to a concrete mixer based on a quantitative feeding structure for building construction. According to the invention, the quantitative cylinder is arranged to receive concrete output by the mixing cylinder, the limit impeller blocks discharging, so that the concrete can be temporarily accumulated in the feeding port, and then the limit impeller rotates after the concrete is sufficiently discharged, so that the concrete can be discharged.

Description

Concrete mixer based on dosing structure for construction

Technical Field

The invention relates to the technical field of building construction, in particular to a concrete mixer based on a quantitative feeding structure for building construction.

Background

The building construction is a building project which is developing, the work of civil engineering is carried out through various instruments and raw materials, the concrete is artificial stone which is prepared by taking cement as a main cementing material, mixing water, sand, stones and chemical additives and mineral additives if necessary, mixing the materials according to a proper proportion, uniformly stirring, closely molding, curing and hardening, and is a practical and common building material, and the concrete is generally prepared on site by adopting a concrete mixer in a construction site;

however, the existing concrete mixer cannot perform quantitative feeding during discharging, so that when the concrete mixer outputs concrete to a transport trolley and other devices, excessive overflow and other phenomena can occur, waste is easily caused, construction environment is easily messy, and the problem is solved by providing the concrete mixer based on the quantitative feeding structure for building construction.

Disclosure of Invention

The invention aims to provide a concrete mixer based on a quantitative feeding structure for building construction, which aims to solve the problem that the conventional concrete mixer cannot perform quantitative feeding during discharging.

In order to achieve the purpose, the invention provides the following technical scheme: a concrete mixer based on a quantitative feeding structure for building construction comprises a chassis and a first motor, wherein a fixed seat is fixedly arranged at the upper end of the chassis, a ball is embedded in the inner wall of the fixed seat, a mixing drum is rotatably arranged on the fixed seat, a guide rail is fixedly arranged on the outer wall of the mixing drum, the guide rail is matched with the ball, the ball is arranged in the guide rail in a sliding connection mode, the first motor is fixedly arranged on the chassis, a transmission shaft is fixedly arranged at the output end of the first motor, the transmission shaft is transversely arranged at the upper end of the chassis through a bearing and a supporting seat, a transmission gear is fixedly arranged on the transmission shaft, a toothed ring is fixedly welded on the outer wall of the mixing drum and is matched with the transmission gear, a feeding hopper is fixedly arranged on the chassis, the lower end opening of the feeding hopper is inserted into the right end opening of the mixing drum, the left end of the chassis is fixedly provided with a quantifying cylinder, the right side of the upper end of the quantifying cylinder is provided with a feeding port, the lower end of the quantifying cylinder is provided with a feeding port, the interior of the quantifying cylinder is transversely provided with a connecting shaft through a bearing, the connecting shaft is fixedly provided with a limiting impeller, the limiting impeller is in a cross shape, the outer diameter of the limiting impeller is matched with the inner diameter of the quantifying cylinder, the front end of the quantifying cylinder is provided with a cavity, the interior of the cavity is provided with a rotating block, the rotating block is fixedly sleeved on the connecting shaft, the outer wall of the rotating block is provided with four limiting grooves around the equal distance, the four limiting grooves are in a cross arrangement, the right side of the inner wall of the cavity is transversely provided with a movable groove, the opening of the movable groove is provided with a limiting block, the upper surface of the left end of the limiting block is in an, an adjusting mechanism is installed at the right end of the front side of the quantifying cylinder, and supporting mechanisms are symmetrically installed on the front side and the rear side of the chassis.

Preferably, the feeding mechanism comprises a feeding pipe, the feeding pipe is fixedly mounted on the right side of the chassis through a supporting seat, a spiral feeding roller is vertically mounted inside the feeding pipe through a bearing, a second motor is fixedly mounted at the lower end of the feeding pipe, the output end of the second motor is fixedly connected with the spiral feeding roller, a feeding port is formed in the right wall of the lower side of the feeding pipe, a feeding port is formed in the left wall of the upper side of the feeding pipe, and the feeding port is opposite to an upper end opening of the feeding hopper.

Preferably, the feeding pipe inclines towards the left from bottom to top, and the inclination angle of the feeding pipe is larger than twenty degrees.

Preferably, the end of the limiting impeller is inclined, and the end of the limiting impeller is attached to the inner wall of the quantifying cylinder.

Preferably, adjustment mechanism includes the threaded rod, the jack has transversely been seted up to the front side right-hand member of a ration section of thick bamboo, and transversely inserts in the jack and be equipped with the threaded rod, fixed mounting has the thread bush in the jack, and the thread bush cup joints on the threaded rod, the movable inslot is arranged in to the inner of threaded rod, the limiting plate is installed through the bearing in the inner of threaded rod, and the limiting plate is in the right-hand member of movable groove.

Preferably, the supporting mechanism includes the fixed block, fixed block fixed welding is on the outer wall on chassis, the jack has vertically been seted up on the fixed block, and vertically inserts in the jack and be equipped with the screw rod, the upper end fixed mounting of screw rod has changeed the handle, the inside fixed mounting of jack has the swivel nut, and the swivel nut cup joints on the screw rod, the support is installed through the bearing to the lower extreme of screw rod, and the support is the fork form, the lower extreme veneer of support has the cushion, stop gear is installed to the lower extreme of support.

Preferably, stop gear includes the conical head, the lower extreme at the support is installed through the bearing in the pivot of conical head, the through-hole has been seted up to the left and right ends symmetry of support, and transversely inserts in the through-hole and be equipped with the gag lever post, left side the inner wall of through-hole is provided with the internal thread, the surface of gag lever post is provided with the external screw thread with the internal thread looks adaptation of through-hole, use the pivot to set up two sets of spacing holes as the symmetrical line on the conical head, and the upside the central point in spacing hole flushes with the central point of through-hole.

Compared with the prior art, the invention has the beneficial effects that: the concrete mixer based on the quantitative feeding structure for building construction receives concrete output by the mixing drum through the quantitative drum, blanking is blocked by the limiting impeller, so that the concrete can be temporarily accumulated in the feeding port, the limiting impeller is influenced by gravity, the rotating block is driven by the connecting shaft to continuously extrude the limiting block in the limiting groove until the weight of the concrete reaches a certain degree, the limiting block can be subjected to enough force and move an extrusion spring in the movable groove, after the limiting block completely exits from the limiting groove, the limiting impeller in a stressed state can rotate and drive the concrete to move downwards until the limiting block is embedded into the next group of limiting grooves through the resilience of the spring, at the moment, the previously stored concrete can be positioned at an inner end opening of the feeding port and discharged from the feeding port, and quantitative feeding can be realized to a certain degree through the mode, the discharging is uniform each time, the loading of the conveying device is convenient, and the phenomenon of excessive waste can be avoided;

by arranging the adjusting mechanism, the adjusting mechanism can extrude and tighten one end, far away from the limiting block, of the spring to change the tensioning degree of the spring, so that the thrust exerted by the spring on the limiting block can be changed, the triggering force of the limiting block and the triggering force of the limiting impeller in rotation can be changed, and the limiting value of the limiting impeller in forced rotation can be adjusted according to the required feeding amount to change the feeding quantitative value;

through setting up supporting mechanism, the support in the supporting mechanism can play the stable effect of support to the device in hard and real ground, and the conical head can insert in muddy road surface for this device uses also to have fine stability in muddy road surface, and the conical head is collapsible to be packed up, and easy operation is convenient, greatly increased this device's suitability.

Description of the drawings:

in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic front view of the structure of the present invention;

FIG. 2 is a schematic sectional elevation view of the structure of the present invention;

FIG. 3 is a schematic rear view of the structure of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 2;

FIG. 5 is a partial cross-sectional view of B of FIG. 1 according to the present invention;

fig. 6 is a schematic structural view of the support mechanism of the present invention.

In the figure: 1. a chassis; 2. a fixed seat; 3. a ball bearing; 4. a mixing drum; 5. a guide rail; 6. a first motor; 7. a drive shaft; 8. a transmission gear; 9. a toothed ring; 10. a feed hopper; 11. feeding pipes; 12. a helical feed roller; 13. a second motor; 14. a feed inlet; 15. a feeding port; 16. a dosing cylinder; 17. a feeding port; 18. a feed port; 19. a connecting shaft; 20. limiting the impeller; 21. a cavity; 22. rotating the block; 23. a limiting groove; 24. a movable groove; 25. a limiting block; 26. a spring; 27. a threaded rod; 28. a threaded sleeve; 29. a limiting plate; 30. a fixed block; 31. a screw; 32. turning a handle; 33. a threaded sleeve; 34. a support; 35. a rubber pad; 36. a conical head; 37. a through hole; 38. a limiting rod; 39. and a limiting hole.

The specific implementation mode is as follows:

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.

Referring to fig. 1-6, an embodiment of the present invention is shown: a concrete mixer based on a quantitative feeding structure for building construction comprises a chassis 1 and a first motor 6, a fixed seat 2 is fixedly installed at the upper end of the chassis 1, a ball 3 is embedded in the inner wall of the fixed seat 2, a mixing drum 4 is rotatably installed on the fixed seat 2, a guide rail 5 is fixedly installed on the outer wall of the mixing drum 4, the guide rail 5 is matched with the ball 3, the ball 3 is arranged in the guide rail 5 in a sliding connection manner, the first motor 6 is fixedly installed on the chassis 1, a transmission shaft 7 is fixedly installed at the output end of the first motor 6, the transmission shaft 7 is transversely installed at the upper end of the chassis 1 through a bearing and a supporting seat, a transmission gear 8 is fixedly installed on the transmission shaft 7, a toothed ring 9 is fixedly welded on the outer wall of the mixing drum 4, the toothed ring 9 is matched with the transmission gear 8, a feed hopper 10 is fixedly installed on the chassis 1, and the lower, the right side of the chassis 1 is provided with a feeding mechanism, the left end of the chassis 1 is fixedly provided with a quantifying cylinder 16, the right side of the upper end of the quantifying cylinder 16 is provided with a feeding port 17, the lower end of the quantifying cylinder 16 is provided with a feeding port 18, the interior of the quantifying cylinder 16 is transversely provided with a connecting shaft 19 through a bearing, the connecting shaft 19 is fixedly provided with a limiting impeller 20, the limiting impeller 20 is in a cross shape, the outer diameter of the limiting impeller 20 is matched with the inner diameter of the quantifying cylinder 16, the front end of the quantifying cylinder 16 is provided with a cavity 21, the interior of the cavity 21 is provided with a rotating block 22, the rotating block 22 is fixedly sleeved on the connecting shaft 19, the outer wall of the rotating block 22 is provided with four groups of limiting grooves 23 around the same distance, the four groups of limiting grooves 23 are arranged in a cross shape, the right side of the inner wall of the cavity 21 is, a spring 26 is transversely arranged in the movable groove 24, the end of the spring 26 is abutted against the limiting block 25, the right end of the front side of the quantifying cylinder 16 is provided with an adjusting mechanism, and the front side and the rear side of the chassis 1 are symmetrically provided with supporting mechanisms;

further, the feeding mechanism comprises a feeding pipe 11, the feeding pipe 11 is fixedly installed on the right side of the chassis 1 through a supporting seat, a spiral feeding roller 12 is vertically installed inside the feeding pipe 11 through a bearing, a second motor 13 is fixedly installed at the lower end of the feeding pipe 11, the output end of the second motor 13 is fixedly connected with the spiral feeding roller 12, a feeding hole 14 is formed in the right wall of the lower side of the feeding pipe 11, a feeding port 15 is formed in the left wall of the upper side of the feeding pipe 11, and the feeding port 15 is opposite to an upper end opening of the feeding hopper 10, as shown in fig. 2, the structure increases the feeding speed, reduces the workload of manual feeding, and can pre-stir the materials to increase the uniformity of the materials during feeding;

further, the feeding pipe 11 inclines from bottom to top towards the left, the inclination angle of the feeding pipe 11 is larger than twenty degrees, as shown in fig. 2, the structure enables the feeding pipe 11 to have a certain inclination angle, so that the gravity of the feeding pipe 11 for bearing materials can incline towards the left, and the supporting seat can bear the maximum force, so that the use stability of the device is improved;

further, the end of the limiting impeller 20 is arranged to be inclined, and the end of the limiting impeller 20 is attached to the inner wall of the quantifying barrel 16, as shown in fig. 4, when the limiting impeller 20 rotates, the blades of the limiting impeller 20 can scrape and rub the inner wall of the quantifying barrel 16, so that concrete adhered to the inner wall of the quantifying barrel 16 is scraped, waste is avoided, and concrete is prevented from caking on the inner wall of the quantifying barrel 16;

further, the adjusting mechanism comprises a threaded rod 27, a jack is transversely formed in the right end of the front side of the quantifying cylinder 16, the threaded rod 27 is transversely inserted into the jack, a threaded sleeve 28 is fixedly mounted in the jack, the threaded sleeve 28 is sleeved on the threaded rod 27, the inner end of the threaded rod 27 is arranged in the movable groove 24, a limiting plate 29 is mounted at the inner end of the threaded rod 27 through a bearing, and the limiting plate 29 is located at the right end of the movable groove 24, as shown in fig. 5, the metering value of feeding can be adjusted through the structure, so that the applicability of the device is improved, and the operation is simple and easy to understand;

further, the supporting mechanism comprises a fixing block 30, the fixing block 30 is fixedly welded on the outer wall of the chassis 1, an insertion hole is vertically formed in the fixing block 30, a screw 31 is vertically inserted into the insertion hole, a rotating handle 32 is fixedly installed at the upper end of the screw 31, a screw sleeve 33 is fixedly installed inside the insertion hole, the screw sleeve 33 is sleeved on the screw 31, a support 34 is installed at the lower end of the screw 31 through a bearing, the support 34 is fork-shaped, a rubber pad 35 is glued at the lower end of the support 34, and a limiting mechanism is installed at the lower end of the support 34, as shown in fig. 6, the structure is used for improving the stability of the device on flat and solid ground;

furthermore, the limiting mechanism comprises a conical head 36, a rotating shaft of the conical head 36 is installed at the lower end of the support 34 through a bearing, through holes 37 are symmetrically formed in the left end and the right end of the support 34, a limiting rod 38 is transversely inserted into the through holes 37, inner threads are formed in the inner wall of the through hole 37 on the left side, external threads matched with the internal threads of the through holes 37 are formed in the surface of the limiting rod 38, two groups of limiting holes 39 are formed in the conical head 36 by taking the rotating shaft as a symmetrical line, and the central point of the limiting hole 39 on the upper side is flush with the central point of the through hole 37, as shown in fig. 6, the structure is used for improving the stability of the device on muddy ground, so that the applicability of the device;

the working principle is as follows: when the mixer is used, the first motor 6 is started firstly, the first motor 6 drives the transmission gear 8 to rotate through the transmission shaft 7, the transmission gear 8 applies force to the meshed toothed ring 9, so that the mixing drum 4 rotates forwards on the fixed seat 2 through the guide rail 5 and the ball 3, then the second motor 13 is opened, the second motor 13 drives the spiral feeding roller 12 to rotate, then materials are fed from the feeding port 14 and enter the feeding pipe 11 and are driven upwards by the rotating spiral feeding roller 12 until the materials are discharged from the feeding port 15, then the materials fall into the feeding hopper 10 from the feeding port 15 and are fed into the mixing drum 4 through the feeding hopper 10, the rotating mixing drum 4 can mix the materials, after the mixing is finished, the first motor 6 can be controlled to rotate reversely, so that the mixing drum 4 is driven to reversely rotate to pour concrete out from the opening at the left end, and the concrete can enter the quantitative drum 16 through the feeding port 17 after being poured out, and is received by the limiting impeller 20 just under the opening of the feeding port 17, the limiting impeller 20 is influenced by the gravity of the concrete, and can drive the rotating block 22 to apply force to the inclined plane of the limiting block 25 through the connecting shaft 19, so that the limiting block 25 exerts a thrust force on the spring 26 under the influence of the extrusion force, when the concrete is accumulated on the limiting impeller 20 to a certain degree, the force exerted by the limiting block 25 on the spring 26 reaches a critical value, and can be contracted towards the inside of the movable groove 24, and the spring 26 is compressed, until the limiting block 25 retreats from the limiting groove 23, the rotating block 22 is not limited, the connecting shaft 19 can rotate, then the limiting impeller 20 can be influenced by the gravity to rotate and can drive the connecting shaft 19 to rotate the rotating block 22, until the rotating block 22 rotates ninety degrees, the next group of limiting groove 23 can be aligned with the limiting block 25, at this time, the spring 26 in the compressed, at this time, the limit impeller 20 is limited, the concrete which is completely received is positioned at the inner end opening of the feeding port 18 and is discharged through the feeding port 18, and the concrete which newly enters the quantitative cylinder 16 is received by the other group of blades of the limit impeller 20 to carry out the next quantitative feeding, in addition, if the force of the limited impeller 20 which is forced to rotate is required to be adjusted so as to change the quantitative value of the concrete blanking, the threaded rod 27 can be rotated, so that the threaded rod 27 and the threaded sleeve 28 carry out the threaded action to drive the limit plate 29 to move towards the left in the movable groove 24, and the right end of the spring 26 is forced to extrude, so that the spring 26 increases the thrust to the limit block 25, the triggering force of the limit impeller 25 is changed, the limit value of the limited impeller 20 which is forced to rotate is enhanced, and the limit value of the limited impeller 20 which is received the concrete and triggered to rotate can be changed by the mode, so as to realize, so as to be convenient for use;

when the device is used, if a construction site is flat and hard, the limiting rod 38 can be rotated, so that the limiting rod 38 is matched with the internal thread of the through hole 37 to be withdrawn from the through hole 37, then the conical head 36 is rotated and collected into the support 34, the stopper rod 38 is then inserted into the through hole 37 and through the stopper hole 39, so that the bit 36 is locked, at which time the device can be rotated by rotating the handle 32, so that the handle 32 drives the screw 31 to rotate and the threaded sleeve 33 performs a threading action to drive the support 34 to move downwards and contact the ground, so that the rubber pad 35 on the lower surface of the support 34 is contacted with the ground, and by operating the four groups of supporting mechanisms to contact the ground, i.e., to increase the stability of the device in use, and when the device is used on muddy roads, the bit 36 can be deployed, so that the bit 36 can be inserted into muddy soil when in use to increase the stability of the device, which is the overall working principle of the present invention.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a concrete mixer based on dosing structure for construction, includes chassis (1) and first motor (6), its characterized in that: the upper end fixed mounting on chassis (1) has fixing base (2), and the inner wall of fixing base (2) has inlayed ball (3), rotate on fixing base (2) and install churn (4), and fixed mounting has guide rail (5) on the outer wall of churn (4), guide rail (5) and ball (3) looks adaptation, ball (3) set up to sliding connection in guide rail (5), fixed mounting has first motor (6) on chassis (1), and the output fixed mounting of first motor (6) has transmission shaft (7), transmission shaft (7) transversely installs the upper end on chassis (1) through bearing and supporting seat, fixed mounting has drive gear (8) on transmission shaft (7), the outer wall fixed welding of churn (4) has ring gear (9), and ring gear (9) and drive gear (8) looks adaptation, fixed mounting has feeder hopper (10) on chassis (1), and the lower extreme opening of feeder hopper (10) inserts in the right-hand member opening of churn (4), the right side on chassis (1) is provided with feed mechanism, the left end fixed mounting on chassis (1) has a ration section of thick bamboo (16), and the upper end right side of a ration section of thick bamboo (16) has seted up pan feeding mouth (17), material inlet (18) are installed to the lower extreme of a ration section of thick bamboo (16), connecting axle (19) are transversely installed through the bearing to the inside of a ration section of thick bamboo (16), and fixed mounting has spacing impeller (20) on connecting axle (19), spacing impeller (20) are the cross, the external diameter of spacing impeller (20) and the internal diameter looks adaptation of a ration section of thick bamboo (16), cavity (21) have been seted up to the front end of a ration section of thick bamboo (16), and the inside of cavity (21) is provided with commentaries on classics piece (22), commentaries, the outer wall of commentaries on classics piece (22) encircles the equidistance and has seted up four sets of spacing grooves (23), and four sets of spacing grooves (23) are the cross and arrange, movable groove (24) have transversely been seted up on the inner wall right side of cavity (21), and the opening part of movable groove (24) installs stopper (25), the left end upper surface of stopper (25) sets up to the slope form, the inside in movable groove (24) transversely is provided with spring (26), and the end of spring (26) offsets with stopper (25), adjustment mechanism is installed to quantitative section of thick bamboo (16) front side right-hand member, supporting mechanism is installed to the bilateral symmetry around chassis (1).

2. The concrete mixer based on dosing structure for building construction according to claim 1, characterized in that: the feeding mechanism comprises a feeding pipe (11), the feeding pipe (11) is fixedly mounted on the right side of the chassis (1) through a supporting seat, a spiral feeding roller (12) is vertically mounted inside the feeding pipe (11) through a bearing, a second motor (13) is fixedly mounted at the lower end of the feeding pipe (11), the output end of the second motor (13) is fixedly connected with the spiral feeding roller (12), a feeding hole (14) is formed in the right wall of the lower side of the feeding pipe (11), a feeding port (15) is formed in the left wall of the upper side of the feeding pipe (11), and the feeding port (15) is right opposite to an upper end opening of the feeding hopper (10).

3. The concrete mixer based on dosing structure for building construction according to claim 2, characterized in that: the feeding pipe (11) inclines towards the left from bottom to top, and the inclination angle of the feeding pipe (11) is larger than twenty degrees.

4. The concrete mixer based on dosing structure for building construction according to claim 1, characterized in that: the end of the limiting impeller (20) is arranged to be inclined, and the end of the limiting impeller (20) is attached to the inner wall of the quantifying cylinder (16).

5. The concrete mixer based on dosing structure for building construction according to claim 1, characterized in that: adjustment mechanism includes threaded rod (27), the jack has transversely been seted up to the front side right-hand member of a ration section of thick bamboo (16), and transversely inserts threaded rod (27) in the jack, fixed mounting has thread bush (28) in the jack, and thread bush (28) cup joint on threaded rod (27), movable groove (24) are arranged in to the inner of threaded rod (27), limiting plate (29) are installed through the bearing in the inner of threaded rod (27), and limiting plate (29) are in the right-hand member of movable groove (24).

6. The concrete mixer based on dosing structure for building construction according to claim 1, characterized in that: the supporting mechanism includes fixed block (30), fixed block (30) fixed welding is on the outer wall of chassis (1), the jack has vertically been seted up on fixed block (30), and vertical the inserting in the jack is equipped with screw rod (31), the upper end fixed mounting of screw rod (31) has commentaries on classics (32), the inside fixed mounting of jack has swivel nut (33), and swivel nut (33) cup joints on screw rod (31), support (34) are installed through the bearing to the lower extreme of screw rod (31), and support (34) are the fork form, the lower extreme veneer of support (34) has cushion (35), stop gear is installed to the lower extreme of support (34).

7. The concrete mixer based on dosing structure for building construction according to claim 6, characterized in that: stop gear includes conical head (36), the lower extreme in support (34) is installed through the bearing in the pivot of conical head (36), through-hole (37) have been seted up to the left and right ends symmetry of support (34), and transversely insert in through-hole (37) and be equipped with gag lever post (38), left side the inner wall of through-hole (37) is provided with the internal thread, the surface of gag lever post (38) is provided with the external screw thread with the internal thread looks adaptation of through-hole (37), use the pivot to set up two sets of spacing holes (39) as the symmetrical line on conical head (36), and the upside the central point of spacing hole (39) flushes with the central point of through-hole (37).