CN115306990A

CN115306990A - Sewage treatment pump of stable use

Info

Publication number: CN115306990A
Application number: CN202210947521.2A
Authority: CN
Inventors: 董雪廷
Original assignee: Bengbu Qianhe Future Information Technology Co ltd
Current assignee: Bengbu Qianhe Future Information Technology Co ltd
Priority date: 2022-08-09
Filing date: 2022-08-09
Publication date: 2022-11-08

Abstract

The invention relates to the field of sewage treatment, in particular to a sewage treatment pump which is stable in use, and the sewage treatment pump comprises a pump base and a pump body arranged on the pump base, wherein wheel shafts extend from the edges of the front end surface and the rear end surface of the pump base, wheels are arranged on the outer sides of the wheel shafts, a supporting piece is arranged in the middle of the front end surface and the rear end surface of the pump base, an extension piece is arranged at the front end of the supporting piece, and a reinforcing piece penetrates through the upper end of the extension piece. The invention can improve the stability in use, prevent the sinking phenomenon in use on the earth surface and ensure that the reinforcing stabs do not move upwards in use.

Description

Sewage treatment pump of stable use

Technical Field

The invention relates to the field of sewage treatment, in particular to a sewage treatment pump which is stable in use.

Background

In the process of carrying out sewage treatment, need use the sewage treatment pump to utilize the sewage treatment pump to take sewage out and handle, however in order to remove the sewage treatment pump for being convenient for among the prior art, often can install the wheel additional on the sewage treatment pump, the sewage treatment pump easily orders about the wheel roll because of the vibrations of self in the use, thereby causes the phenomenon that the pump body removed, and is not stable enough during its use.

Disclosure of Invention

The invention aims to solve the defects in the background art and provides a sewage treatment pump which is stable in use.

In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: the utility model provides a sewage treatment pump of stable use, includes the pump seat and installs the pump body on the pump seat, terminal surface edge has all extended the shaft around the pump seat, the outside of shaft is provided with the wheel, terminal surface mid-mounting has support piece around the pump seat, support piece's front end is installed and is stretched out the piece, the upper end of stretching out the piece is run through and is installed the reinforcement.

Preferably, support piece includes that two sets of terminal surface middle parts of fixed mounting bear the frame around the pump seat, the up end that bears the frame runs through to rotate inlays the threaded rod, the threaded rod is located the up end middle part position that bears the frame, the threaded sleeve is screwed in the outside of threaded rod, the outer surface symmetry extension of threaded sleeve has two sets of support frames, and is two sets of the equal fixed mounting in lower extreme of support frame has the main tributary to prop up the seat, the shape of support frame is L shape.

Preferably, support frame and thread bush integrated into one piece, the upper end fixed mounting of threaded rod has a hand wheel, the axial lead of a hand wheel and the axial lead collineation of threaded rod, it is two sets of the up end of support frame extends respectively has two sets of guide prism, and is two sets of the axial lead that the guide prism used the threaded rod is symmetrical as the center of symmetry, the up end symmetry that bears the frame runs through and has seted up two sets of guide ways, the guide prism laminates in the inside of guide way, support frame and the prismatic integrated into one piece of direction.

Preferably, the piece that stretches out is including extending two sets of shells that stretch out at the front end of two sets of support frames respectively, and is two sets of stretch out the inside laminating respectively of shell and install two sets of seats that stretch out, and is two sets of stretch out and be connected with the screw ring between the seat, the inside of screw ring is screwed and is had the regulation double-screw bolt, the lower extreme rotation of adjusting the double-screw bolt is connected with and bears the crane span structure, the lower extreme fixed mounting who bears the crane span structure has vice supporting seat, the rear end of vice supporting seat is run through and is seted up the breach, the support frame is located the breach department on vice supporting seat, the lower terminal surface laminating of vice supporting seat in the up end of main tributary supporting seat.

Preferably, a reinforcing plate obliquely extends from the edge of the rear end face of the bearing bridge frame, the lower end of the reinforcing plate is fixedly connected with the upper end face of the auxiliary supporting seat, a compression stud penetrates through and is screwed into the front edge of the upper end face of the extending shell, the lower end of the compression stud is compressed onto the upper end of the extending seat, a second hand wheel is fixedly mounted at the upper end of the compression stud, and the axis of the second hand wheel is collinear with the axis of the compression stud.

Preferably, the preceding terminal surface that stretches out the seat extends and has even solid frame, even the back tip fixed mounting that gu the frame has and stretches out the piece, the tip that stretches out the piece is connected with the external fixed surface of screw ring, the up end symmetry that bears the crane span structure extends has two sets of directional posts, and is two sets of directional post is symmetrical as the center of symmetry with the axial lead of adjusting the double-screw bolt, the up end that stretches out the piece runs through and has seted up the round hole, directional post laminates in the inside of round hole, the upper end fixed mounting of adjusting the double-screw bolt has No. three hand wheels, the axial lead of No. three hand wheels and the axial lead collineation of adjusting the double-screw bolt.

Preferably, the reinforcement sets up two sets of bedplate that strikes of keeping away from edge in the top of vice supporting seat including the symmetry, the lower terminal surface linear array that strikes the bedplate extends and has the multiunit to consolidate the thorn post, the lower extreme of consolidating the thorn post is seted up to the taper, the position linear array that edge was kept away from to the up end of vice supporting seat runs through and has seted up the multiunit through-hole, it is located the inside of through-hole to consolidate the thorn post, the position that edge is close to in the top of vice supporting seat is connected with and bears the weight of the pressure seat.

Preferably, two ends of the knocking seat plate are respectively inlaid with two groups of guide rings, two groups of guide rings are respectively mounted inside the guide rings in a fitting mode, the lower ends of the guide rings are fixedly connected with the upper ends of the auxiliary supporting seats, spring bodies are wound on the outer sides of the guide rings and are located between the upper ends of the auxiliary supporting seats and the lower ends of the guide rings, limiting caps are fixedly mounted at the upper ends of the guide rings and are integrally formed with the guide rings, connecting columns penetrate through and are embedded in the edges of the upper ends of the bearing pressing seats in a rotating mode, the lower ends of the connecting columns are fixedly connected with the upper ends of the auxiliary supporting seats, and the front edges of the lower ends of the bearing pressing seats are arranged to be guiding inclined planes.

Compared with the prior art, the invention has the following beneficial effects:

1. through the support piece that sets up, can directly grasp a hand wheel and rotate, and then drive the threaded rod and rotate, move down in order to order about the thread bush of screwing on the threaded rod, thereby drive the support frame and move down, the guide prism slides in the guide way on bearing the frame at this moment and moves down with the auxiliary stay frame, make the main tributary support seat of support frame tip contact with ground, prop up the wheel simultaneously and break away from ground, support the pump body with replacing the wheel through the main tributary support seat, in order to avoid the in-process pump body to appear moving phenomenon, stability when using with this improvement.

2. Simultaneously when on the earth, can directly rotate No. two hand wheels, in order to loosen the compression double-screw bolt, make the fixed seat that stretches out that is compressed tightly by the compression double-screw bolt slide in stretching out the shell, in order to stretch out the seat and stretch out, and then drive the top that vice supporting seat antedisplacement breaks away from the main tributary supporting seat, directly rotate No. three hand wheels afterwards, make the regulation double-screw bolt rotate, in order to utilize and screw thread between the screw ring order about vice supporting seat to move down, make the lower terminal surface of vice supporting seat and the lower terminal surface coplane of main tributary supporting seat, in order to support jointly through vice supporting seat, the main tributary supporting seat, with this increase holding surface, the phenomenon of sinking appears when preventing to use on the earth.

3. Through the reinforcement that sets up, can directly strike the bedplate of strikeing, make the bedplate of strikeing that props up by the spring body can move down, the guide ring slides on the guide pillar this moment, move down perpendicularly in the through-hole of vice supporting seat in order to drive the reinforcement thorn post, in order to pierce the ground, in order to improve the stationary force between vice supporting seat and the ground, stability when using with this further improvement, and bear the weight of through the direct rotation and press the seat, in order to bear the weight of pressing the seat to cover on the bedplate of strikeing after moving down, in order to fix the bedplate of strikeing that moves down, fix the reinforcement thorn post in piercing the ground promptly, in order to guarantee to consolidate the thorn post when using and can not appear shifting up the phenomenon.

Drawings

FIG. 1 is a schematic view showing a structure of a sewage treatment pump according to the present invention in a stable use;

FIG. 2 is a schematic view of a carrier of a sewage treatment pump of the present invention in a stable use;

FIG. 3 is a schematic view of a threaded ring of a sewage treatment pump of the present invention in a stable use;

FIG. 4 is a schematic view of a knocking seat plate of a sewage treatment pump for stable use according to the present invention;

FIG. 5 is a schematic view of a pressure bearing seat of a sewage treatment pump for stable use according to the present invention;

FIG. 6 is a schematic view of another aspect of a sewage treatment pump of the present invention in a stable use.

In the figure: 1. a pump mount; 2. a pump body; 3. a wheel axle; 4. a wheel; 5. a carrier; 6. a threaded ring; 7. knocking the seat board; 8. a bearing pressure seat; 9. a threaded rod; 10. a first hand wheel; 11. a guide groove; 12. a guiding prism; 13. a support frame; 14. a threaded sleeve; 15. a guide slope; 16. connecting columns; 17. an auxiliary supporting seat; 18. a main supporting seat; 19. reinforcing the barbed columns; 20. a through hole; 21. a guide post; 22. a spring body; 23. a guide ring; 24. a limiting cap; 25. a reinforcing plate; 26. carrying the bridge; 27. extending the shell; 28. a protruding seat; 29. compressing the stud; 30. a second hand wheel; 31. a connecting and fixing frame; 32. a protruding block; 33. adjusting the stud; 34. a third hand wheel; 35. and (4) orienting the column.

Detailed Description

The following description is provided to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.

As shown in fig. 1-6, the sewage treatment pump comprises a pump base 1 and a pump body 2 installed on the pump base 1, wherein wheel shafts 3 extend from the front end face edge and the rear end face edge of the pump base 1, wheels 4 are arranged on the outer sides of the wheel shafts 3, a supporting piece is installed in the middle of the front end face and the rear end face of the pump base 1, an extending piece is installed at the front end of the supporting piece, and a reinforcing piece is installed at the upper end of the extending piece in a penetrating mode.

Support piece includes two sets of carriers 5 of fixed mounting terminal surface middle part around pump block 1, carrier 5 plays the effect of bearing threaded rod 9, the up end of carrier 5 runs through to rotate inlays threaded rod 9, threaded rod 9 is located the up end middle part position of carrier 5, threaded rod 9's the outside is screwed threaded sleeve 14, cooperation between threaded sleeve 14 and the threaded rod 9 plays the effect that drives support frame 13 and reciprocate, threaded sleeve 14's surface symmetry extends has two sets of support frames 13, the equal fixed mounting of lower extreme of two sets of support frames 13 has main tributary support seat 18, the shape of support frame 13 is L shape, support frame 13 plays the effect of support.

Support frame 13 and thread bush 14 integrated into one piece, the upper end fixed mounting of threaded rod 9 has a hand wheel 10, a hand wheel 10 plays and is convenient for carry out the pivoted effect to threaded rod 9, the axial lead of hand wheel 10 and the axial lead collineation of threaded rod 9, the up end of two sets of support frames 13 extends respectively has two sets of prismatic 12 of direction, prismatic 12 of direction plays and leads to support frame 13, prevent that support frame 13 from appearing the effect of rotation phenomenon, two sets of prismatic 12 of direction use the axial lead of threaded rod 9 as the center of symmetry symmetrical, the up end symmetry of bearing frame 5 runs through and has seted up two sets of guide ways 11, prismatic 12 laminating of direction is in the inside of guide way 11, guide way 11 plays and carries out the effect of restricting to prismatic 12 of direction, support frame 13 and prismatic 12 integrated into one piece of direction.

The extension piece comprises two groups of extension shells 27 extending at the front ends of the two groups of support frames 13 respectively, the extension shells 27 play a role in limiting extension seats 28, two groups of extension seats 28 are respectively attached to the inside of the extension shells 27, two groups of extension seats 6 are connected between the two groups of extension seats 28, the extension seats 28 play a role in extending the auxiliary support seat 17, an adjusting stud 33 is screwed inside the threaded ring 6, the lower end of the adjusting stud 33 is rotatably connected with a bearing bridge 26, the adjusting stud 33 and the threaded ring 6 are matched to drive the auxiliary support seat 17 to move up and down, the auxiliary support seat 17 is fixedly installed at the lower end of the bearing bridge 26, the bearing bridge 26 plays a role in uniformly conducting support, a notch is formed in the rear end of the auxiliary support seat 17 in a penetrating mode, the support frames 13 are located at the notch of the auxiliary support seat 17, and the lower end face of the auxiliary support seat 17 is attached to the upper end face of the main support seat 18.

The edge of the rear end face of the bearing bridge frame 26 is obliquely extended with a reinforcing plate 25, the reinforcing plate 25 plays a role in reinforcing the connection between the bearing bridge frame 26 and the auxiliary supporting seat 17 and improving the supporting force, the lower end of the reinforcing plate 25 is fixedly connected with the upper end face of the auxiliary supporting seat 17, a compression stud 29 is screwed in the front edge of the upper end face of the extending shell 27 in a penetrating manner, the lower end of the compression stud 29 is compressed at the upper end of the extending seat 28, the compression stud 29 plays a role in compressing the extending seat 28 so as to fix the extending seat 28 in the extending shell 27, a second hand wheel 30 is fixedly installed at the upper end of the compression stud 29, the axial lead of the second hand wheel 30 is collinear with the axial lead of the compression stud 29, and the second hand wheel 30 plays a role in facilitating the rotation of the compression stud 29.

The front end face of the extending seat 28 is extended with a connecting and fixing frame 31, the rear end portion of the connecting and fixing frame 31 is fixedly provided with an extending block 32, the end portion of the extending block 32 is fixedly connected with the outer surface of the threaded ring 6, the connecting and fixing frame 31 and the extending block 32 play a role of fixing the extending seat 28 and the threaded ring 6 together, the upper end face of the bearing bridge 26 is symmetrically extended with two groups of directional columns 35, the two groups of directional columns 35 are symmetrical by taking the axial lead of the adjusting stud 33 as a symmetrical center, the directional columns 35 play a role of ensuring that the bearing bridge 26 cannot rotate, the upper end face of the extending block 32 is provided with a round hole in a penetrating manner, the round hole plays a role of limiting the directional columns 35, the directional columns 35 are attached to the inside of the round hole, the upper end of the adjusting stud 33 is fixedly provided with a third hand wheel 34, the axial lead of the third hand wheel 34 is collinear with the axial lead of the adjusting stud 33, and the third hand wheel 34 plays a role of facilitating rotation of the adjusting stud 33.

The reinforcement sets up two sets of bedplate 7 that beat of keeping away from the edge in the top of vice supporting seat 17 including the symmetry, the lower extreme line nature array that beats bedplate 7 extends and has multiunit reinforcement thorn post 19, the lower extreme of reinforcement thorn post 19 is seted up for the taper, can be convenient for pierce in the ground, the position linear array that edge was kept away from to the up end of vice supporting seat 17 runs through and has seted up multiunit through-hole 20, reinforcement thorn post 19 is located the inside of through-hole 20, through-hole 20 plays the effect of guaranteeing to reinforce thorn post 19 and pass vice supporting seat 17 smoothly, the position that the top of vice supporting seat 17 is close to the edge is connected with and bears pressure seat 8, directly strike bedplate 7 knocking, make the bedplate 7 that knocks that is propped by spring body 22 move down, guide ring 23 slides on guide pillar 21 this moment, move down perpendicularly in the through-hole 20 of vice supporting seat 17 with driving reinforcement thorn post, in order to pierce in the ground, in order to improve the stationary force between vice supporting seat 17 and the ground, it plays to press the fixed effect of covering to beating bedplate 7 that moves down to bear pressure seat 8.

Two ends of the knocking seat plate 7 are respectively embedded with two groups of guide rings 23, two groups of guide pillars 21 are respectively installed inside the two groups of guide rings 23 in a fitting mode, the lower ends of the two groups of guide pillars 21 are fixedly connected with the upper end of the auxiliary support seat 17, the guide rings 23 and the guide pillars 21 play a role in guaranteeing the knocking seat plate 7 to vertically move up and down, spring bodies 22 are wound on the outer sides of the guide pillars 21, the spring bodies 22 play a role in jacking and resetting the reinforcing barbed posts 19 when not supporting, the auxiliary support seat 17 is not blocked when being retracted, the spring bodies 22 are located between the upper end of the auxiliary support seat 17 and the lower end of the guide rings 23, limiting caps 24 are fixedly installed at the upper ends of the guide pillars 21, the limiting caps 24 and the guide pillars 21 are integrally formed, the limiting caps 24 play a role in preventing the guide rings 23 from being separated from the guide pillars 21, a connecting post 16 penetrates through and is rotatably embedded at the edge of the upper end of the bearing pressure seat 8, the lower end of the connecting post 16 is fixedly connected with the upper end of the auxiliary support seat 17, the connecting post 16 plays a role in connecting, the front edge of the bearing pressure seat plate 8 is opened to form a guide slope 15, and can be pressed on the knocking seat plate 7.

During extraction, when the pump is used on the ground, the pump body 2 can be pushed to a designated position by using the wheels 4, then the first hand wheel 10 is directly grasped to rotate, the threaded rod 9 is driven to rotate, the threaded sleeve 14 screwed on the threaded rod 9 is driven to move downwards, the support frame 13 is driven to move downwards, the guide prism 12 slides in the guide groove 11 on the bearing frame 5 to assist the support frame 13 to move downwards, the main support seat 18 at the end part of the support frame 13 can be in contact with the ground, the wheels 4 are supported and separated from the ground, the pump body 2 is supported by the main support seat 18 instead of the wheels 4, then sewage can be extracted and treated by using the pump body 2, when the pump is used on the ground, after the main support seat 18 is put down, the second hand wheel 30 is directly rotated to loosen the pressing stud 29, the extending seat 28 pressed and fixed by the pressing stud 29 can slide in the extending shell 27 to extend the extending seat 28, the auxiliary support seat 17 is driven to move forwards to be separated from the upper part of the main support seat 18, then the hand wheel 34 is directly rotated, the adjusting stud 33 to move downwards, the extending seat 28 is driven to move downwards, the lower end face of the thread ring 6, the support seat 7 is driven to move downwards, the upper end face of the auxiliary support seat 7 to be knocked, the upper end face of the auxiliary support seat 7, the support seat 17, the coplanar support seat 7 is knocked, the upper end face of the upper support seat 17, the coplanar bearing ring 7 is knocked, the upper support seat 7, the upper end face of the upper support seat 7 is knocked, the upper support seat 7 is directly, the upper support seat 7 is knocked, the lower support seat 7, i.e. the fastening of the reinforcement spikes 19 that penetrate into the ground, and the subsequent extraction of the sewage by means of the pump body 2.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a sewage treatment pump of stable use, includes pump seat (1) and installs pump body (2) on pump seat (1), its characterized in that: the utility model discloses a pump seat, including pump seat (1), wheel axle (3) have all been extended to the front and back terminal surface edge of pump seat (1), the outside of wheel axle (3) is provided with wheel (4), the front and back terminal surface mid-mounting of pump seat (1) has support piece, support piece's front end is installed and is stretched out the piece, the upper end that stretches out the piece is run through and is installed the reinforcement.

2. A stable use sewage treatment pump according to claim 1 wherein: support piece includes that two sets of terminal surface middle parts of fixed mounting bear frame (5) around pump seat (1), the up end that bears frame (5) runs through to rotate inlays threaded rod (9), threaded rod (9) are located the up end middle part position that bears frame (5), the outside of threaded rod (9) is screwed threaded sleeve (14), the surface symmetry of threaded sleeve (14) extends there are two sets of support frames (13), and is two sets of the equal fixed mounting of lower extreme of support frame (13) has main tributary support seat (18), the shape of support frame (13) is L shape.

3. A stable use sewage treatment pump according to claim 2 wherein: support frame (13) and thread bush (14) integrated into one piece, the upper end fixed mounting of threaded rod (9) has hand wheel (10) No. one, the axial lead of hand wheel (10) and the axial lead collineation of threaded rod (9), and is two sets of the up end of support frame (13) extends respectively has two sets of direction prism (12), and is two sets of the axis lead that the direction prism (12) used threaded rod (9) is symmetrical as the center of symmetry, bear the up end symmetry of bearing frame (5) and run through and seted up two sets of guide ways (11), the direction prism (12) laminate in the inside of guide way (11), support frame (13) and direction prism (12) integrated into one piece.

4. A stable use sewage treatment pump according to claim 2 wherein: stretch out the piece including extending two sets of shells (27) that stretch out at the front end of two sets of support frames (13) respectively, it is two sets of stretch out the inside laminating respectively of shell (27) and install two sets of seat (28) that stretch out, it is two sets of stretch out and be connected with screw ring (6) between seat (28), the inside of screw ring (6) is screwed there is regulation double-screw bolt (33), the lower extreme of adjusting double-screw bolt (33) rotates and is connected with and bears crane span structure (26), the lower extreme fixed mounting who bears crane span structure (26) has vice supporting seat (17), the rear end of vice supporting seat (17) is run through and has been seted up the breach department, support frame (13) are located vice supporting seat (17), the lower terminal surface laminating of vice supporting seat (17) is in the up end face of main tributary supporting seat (18).

5. A stable sewage treatment pump of claim 4 wherein: the bearing bridge frame is characterized in that a reinforcing plate (25) extends obliquely from the edge of the rear end face of the bearing bridge frame (26), the lower end of the reinforcing plate (25) is fixedly connected with the upper end face of the auxiliary supporting seat (17), a pressing stud (29) penetrates through and is screwed to the front edge of the upper end face of the extending shell (27), the lower end of the pressing stud (29) is pressed at the upper end of the extending seat (28), a second hand wheel (30) is fixedly mounted at the upper end of the pressing stud (29), and the axial lead of the second hand wheel (30) is collinear with the axial lead of the pressing stud (29).

6. A stable sewage treatment pump of claim 4 wherein: the preceding terminal surface that stretches out seat (28) extends and has even solid frame (31), the back tip fixed mounting who links solid frame (31) has and stretches out piece (32), the tip that stretches out piece (32) is connected with the external fixed surface of screw ring (6), the up end symmetry that bears crane span structure (26) extends has two sets of directional post (35), and is two sets of directional post (35) are symmetrical as the center of symmetry with the axial lead of adjusting double-screw bolt (33), the up end that stretches out piece (32) runs through and has seted up the round hole, directional post (35) laminate in the inside of round hole, the upper end fixed mounting of adjusting double-screw bolt (33) has No. three hand wheel (34), the axial lead of No. three hand wheel (34) and the axial lead collineatness of adjusting double-screw bolt (33).

7. A stable sewage treatment pump of claim 4 wherein: the reinforcement sets up two sets of bedplate (7) of strikeing of keeping away from the edge in the top of vice supporting seat (17) including the symmetry, the lower terminal surface linear array who strikes bedplate (7) extends and has multiunit reinforcement thorn post (19), the lower extreme of reinforcement thorn post (19) is opened and is established to the taper, the upper end of vice supporting seat (17) is kept away from the position linear array of edge and is run through and has been seted up multiunit through-hole (20), reinforcement thorn post (19) are located the inside of through-hole (20), the position that the top of vice supporting seat (17) is close to the edge is connected with and bears pressure seat (8).

8. A stabilized sewage treatment pump as claimed in claim 7 wherein: two ends of the knocking seat plate (7) are respectively embedded with two groups of guide rings (23), the inner parts of the two groups of guide rings (23) are respectively attached with two groups of guide pillars (21), the lower ends of the two groups of guide pillars (21) are fixedly connected with the upper ends of the auxiliary support seats (17), the outer sides of the guide pillars (21) are wound with spring bodies (22), the spring bodies (22) are located between the upper ends of the auxiliary support seats (17) and the lower ends of the guide rings (23), the upper ends of the guide pillars (21) are fixedly provided with limit caps (24), the limit caps (24) and the guide pillars (21) are integrally formed, the edge of the upper end of the bearing pressure seat (8) is penetrated and rotatably embedded with a connecting column (16), the lower end of the connecting column (16) is fixedly connected with the upper ends of the auxiliary support seats (17), and the front edge of the lower end of the bearing pressure seat (8) is provided with a guide inclined plane (15).