CN116044748A

CN116044748A - Screw pump

Info

Publication number: CN116044748A
Application number: CN202211416346.0A
Authority: CN
Inventors: 林坤宁; 杨兴杰; 黄尚礼
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-11-12
Filing date: 2022-11-12
Publication date: 2023-05-02

Abstract

The invention relates to a screw pump, which comprises a pump body, wherein a motor is arranged on the pump body, a feed pipe and a discharge pipe are respectively arranged at two ends of the pump body, a screw is rotationally connected with the pump body, the screw pump also comprises an oil sludge stirring and pushing device, and the oil sludge stirring and pushing device comprises: the hopper is arranged on the outer side of the pump body and is rotationally connected with the discharge pipe, and a trough is fixedly communicated below the hopper; the stirring mechanism is used for fully stirring the dirty oil sludge; the transmission mechanism is used for driving the stirring mechanism to rotate; the pushing mechanism is arranged on the stirring mechanism and used for pushing the oil sludge to the inlet of the feeding pipe. According to the invention, the stirring rod is arranged on the rotating sleeve, so that the stirring rod is driven to rotate along with the rotating sleeve when the rotating sleeve rotates, and simultaneously rotates, thereby scattering the sludge caking entering the inlet of the screw pump and preventing the screw pump from being blocked.

Description

Screw pump

Technical Field

The invention relates to the technical field of screw pumps, in particular to a screw pump.

Background

With the continuous improvement of the scientific and technical level, the demand of people on petroleum is continuously increased, but in the petroleum processing production process, a large amount of dirty oil sludge is formed, the components of the dirty oil sludge are complex, serious harm is caused to air, soil and water in the environment, in the prior art, a screw pump is generally used for pumping the dirty oil sludge, but the following problems often occur when the screw pump is used for pumping:

1. because the flowing phase of the sewage sludge is poor, the efficiency is low and the suction phenomenon is often generated when the screw pump pumps the sewage sludge, so that the service life of the screw pump is shortened;

2. because the dirty oil sludge is easy to agglomerate, the screw pump is often blocked, so that the pumping is not smooth, and the normal pumping work is influenced;

3. in the prior art, a large amount of water is required to be injected into the sewage sludge to improve the fluidity of the sewage sludge, so that a large amount of water resources are consumed, and the waste of the resources is caused;

4. because the mobility of dirty oil sludge is relatively poor, can make the screw pump can not clean up all dirty oil sludge in the collecting vat when carrying dirty oil sludge, but need the manual work remove with the hose of access connection, just can accomplish.

Disclosure of Invention

In view of the above, it is necessary to provide a screw pump capable of stirring the dirty oil sludge and preventing the suction phenomenon.

The invention discloses a screw pump, which comprises a pump body, wherein a motor is arranged on the pump body, a feed pipe and a discharge pipe are respectively arranged at two ends of the pump body, a screw rod is rotationally connected with the pump body, one end of the screw rod penetrates out of the pump body and is fixedly connected with the output end of the motor, the screw pump also comprises an oil sludge stirring and pushing device arranged on the pump body, and the oil sludge stirring and pushing device comprises: the hopper is arranged on the outer side of the pump body and is rotationally connected with the discharging pipe, a trough is fixedly communicated with the lower part of the hopper, and an inner gear ring is fixedly connected to an opening at the upper end of the trough; the stirring mechanism is arranged on the feeding pipe and is used for fully stirring the dirty oil sludge; the transmission mechanism is arranged between the motor and the stirring mechanism and is used for driving the stirring mechanism to rotate; the pushing mechanism is arranged on the stirring mechanism and is used for pushing the sewage sludge to the inlet of the feeding pipe.

In one embodiment, the screw is divided into a first screw and a second screw which are rotationally connected with the pump body, one end of the first screw penetrates out of the pump body and is fixedly connected with a first gear, the first screw is fixedly connected with the output end of the motor, and one end of the second screw penetrates out of the pump body and is fixedly connected with a second gear meshed with the first gear.

In one embodiment, the stirring mechanism comprises: the rotary sleeve is rotationally connected to the feeding pipe, and the edge of the lower end of the rotary sleeve is fixedly connected with a third gear meshed with the annular gear; the stirring rods are rotatably connected to the rotating sleeve and provided with three stirring rods, a flow channel is arranged at the central axis of each stirring rod, and a plurality of stirring rods are arranged on the outer side of each stirring rod, which is positioned on the flow channel; the fourth gear is fixedly connected to the feeding pipe, a fifth gear, a sixth gear and a seventh gear are meshed with the fourth gear, and the fifth gear, the sixth gear and the seventh gear are respectively and fixedly connected to the three stirring rods.

In one embodiment, four stirring rods on each stirring rod are arranged, and the four stirring rods are distributed in a circumferential array with the flow channel as a center.

In one embodiment, three of the stirring rods are distributed in an equilateral triangle.

In one embodiment, the transmission mechanism comprises a driving bevel gear fixedly connected with the other output end of the motor, the driving bevel gear is meshed with a driven bevel gear rotationally connected with the pump body, the driven bevel gear is coaxially and fixedly connected with a first belt pulley, and the first belt pulley is connected with a second belt pulley fixedly connected with the upper end of the rotating sleeve through a belt.

In one embodiment, the pushing mechanism comprises: the rotary drum is rotationally connected to the rotary sleeve, an eighth gear meshed with the fourth gear is fixedly connected to the rotary drum, a track groove is formed in the inner wall of the rotary drum, the track groove comprises a first groove, a first spiral groove, a second groove and a second spiral groove which are sequentially communicated end to end, a connecting rod is slidingly connected in the rotary drum, a protrusion slidingly connected with the track groove is fixedly connected to the connecting rod, and a moving ring is fixedly connected to the lower end of the connecting rod; the connecting ring is rotationally connected with the feeding pipe, a sliding rod is connected to the connecting ring in a sliding manner, and the sliding rod is fixedly connected with one end of the movable ring; the pushing plate is connected to the moving ring in a sliding manner, a first spring is arranged between the pushing plate and the moving ring, a positioning mechanism is arranged between the inner end of the pushing plate and the moving ring, and one end, located on the outer side of the moving ring, of the pushing plate is connected with a telescopic rod in a rotating manner; the telescopic cylinder is rotationally connected to the rotating sleeve, the telescopic cylinder is in sliding connection with the telescopic rod, and a second spring used for pushing the telescopic rod to move outwards is arranged between the telescopic cylinder and the telescopic rod.

In one embodiment, the positioning mechanism comprises a positioning pin and a positioning groove, the positioning pin is slidably connected to the moving ring, the positioning groove is arranged on the pushing plate, one end of the positioning pin is fixedly connected with a positioning block, a third spring for pushing the positioning block to be clamped into the positioning groove is arranged between the positioning pin and the moving ring, and the upper end of the positioning pin is fixedly connected with a control rod penetrating out of the upper surface of the moving ring and used for touching the connecting ring.

In one embodiment, a guide inclined plane is arranged on one side of the positioning block, which faces the positioning groove.

The invention has the beneficial effects that:

1. through set up the stirring rod on rotating the cover for when rotating the cover and rotating the cover, drive the stirring rod and not only rotate along with rotating the cover, also rotate simultaneously, and then will get into the dirty oil mud caking of screw pump import and break up, prevent its jam screw pump.

2. Through set up the rotatory section of thick bamboo in taking the track groove on the rotating sleeve, through the gear cooperation mode, make when rotating sleeve rotates, rotatory section of thick bamboo autorotation, owing to protruding and track groove cooperation, and then drive connecting rod reciprocating motion from top to bottom when rotatory section of thick bamboo autorotation, simultaneously through the drive of telescopic link and second spring, and the cooperation between movable ring and the pushing plate, in addition, positioning mechanism's cooperation, make the connecting rod can drive movable ring and pushing plate decline when descending, so under the effect of telescopic link, promote the pushing plate and remove to the movable ring until the pushing plate removes under the inlet pipe, when the connecting rod upwards moves, drive the pushing plate upwards through the movable ring, push the dirty oil sludge of arranging in the inlet pipe below to the inlet of inlet pipe, thereby avoid sucking the sky, and when movable ring and feed inlet touch, positioning mechanism releases the limit, promote the telescopic link under the effect of second spring and stretch out, make the pushing plate leave the inlet pipe, and avoid blocking the material entering, in the continuous rotation of rotating sleeve, constantly accomplish the work of returning, prevent sucking the sky, guarantee screw pump work.

3. Through set up the runner in the stirring rod for when the stirring rod rotates, let in water through the runner to the dirty oil sludge in, and utilize the stirring of stirring rod to make dirty oil sludge and water mix, improve the mobility of dirty oil sludge, and outwards go out water through a large amount of apopores, make the mixed area of water and dirty oil sludge increase, and then hydroenergy and dirty oil sludge carry out intensive mixing, avoid the waste of water resource.

4. Through gear cooperation transmission mode for when rotating the cover, can drive the pump body and rotate as the axle with the axis of silo, and then drive inlet pipe part and rotate, not only can carry out more intensive mixing to the dirty oil mud in the hopper, but also can absorb the dirty oil mud of each position in the silo, can all carry dirty oil mud.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a cross-sectional view taken along the direction A-A in FIG. 1 in accordance with the present invention;

FIG. 3 is a cross-sectional view taken along the direction B-B in FIG. 1 in accordance with the present invention;

FIG. 4 is a cross-sectional view taken along the direction C-C in FIG. 3 in accordance with the present invention;

FIG. 5 is an enlarged view of the invention at I in FIG. 1;

FIG. 6 is a sectional view taken along the direction D-D in FIG. 5 in accordance with the present invention;

FIG. 7 is an enlarged view of the portion II of FIG. 5 in accordance with the present invention;

FIG. 8 is a three-dimensional view of the interior of the rotary drum of the present invention;

fig. 9 is a three-dimensional view of the inside of the rotary drum of the present invention in another direction.

In the figure, a pump body 1, a first screw 11, a second screw 12, a first gear 13, a second gear 14, a motor 15, a drive bevel gear 16, a driven bevel gear 17, a feed pipe 18, a fourth gear 181, a discharge pipe 19, a trough 21, a hopper 22, an inner gear ring 23, a first pulley 31, a belt 32, a second pulley 33, a rotating sleeve 41, a third gear 42, a stirring rod 43, a stirring rod 431, a flow passage 432, a fifth gear 441, a sixth gear 442, a seventh gear 443, an eighth gear 444, a connecting ring 45, a moving ring 461, a connecting rod 4611, a boss 4612, a slide bar 4613, a pushing plate 462, a positioning groove 4621, a first spring 463, a rotating cylinder 5, a first groove 51, a first spiral groove 52, a second groove 53, a second spiral groove 54, a telescopic cylinder 61, a chute 611, a telescopic rod 62, a slider 621, a second spring 63, a positioning pin 71, a control rod 711, a positioning block 712, and a third spring 72.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It will be understood that when an element is referred to as being "mounted" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, a screw pump, including pump body 1, install motor 15 on the pump body 1, the both ends of pump body 1 are provided with inlet pipe 18 and discharging pipe 19 respectively, the inside rotation of pump body 1 is connected with the screw rod, just the one end of screw rod wear out pump body 1 and with the output fixed connection of motor 15, the screw pump still including set up in the sludge stirring pusher on the pump body 1, the sludge stirring pusher includes: the hopper 22 is arranged on the outer side of the pump body 1 and is rotationally connected with the discharge pipe 9, a trough 21 is fixedly communicated below the hopper 22, and an inner gear ring 23 is fixedly connected to an opening at the upper end of the trough 21; the stirring mechanism is arranged on the feeding pipe 18 and is used for fully stirring the dirty oil sludge; the transmission mechanism is arranged between the motor 15 and the stirring mechanism and is used for driving the stirring mechanism to rotate; and the pushing mechanism is arranged on the stirring mechanism and is used for pushing the sewage sludge to the inlet of the feeding pipe 18.

Preferably, as shown in fig. 2, the screw is divided into a first screw 11 and a second screw 12 rotatably connected with the pump body 1, one end of the first screw 11 penetrates out of the pump body 1 and is fixedly connected with a first gear 13, the first screw 11 is fixedly connected with the output end of the motor 15, and one end of the second screw 12 penetrates out of the pump body 1 and is fixedly connected with a second gear 14 meshed with the first gear 13.

Preferably, as shown in fig. 1, 3 and 5, the stirring mechanism includes: a rotating sleeve 41 rotatably connected to the feed pipe 18, wherein a third gear 42 meshed with the annular gear 23 is fixedly connected to the lower end edge of the rotating sleeve 41; the stirring rods 43 are rotatably connected to the rotating sleeve 41 and provided with three stirring rods, a flow passage 432 is arranged at the central axis of each stirring rod 43, and a plurality of stirring rods 431 are arranged on the outer side of each stirring rod 43 positioned on the flow passage 432; the fourth gear 181 is fixedly connected to the feeding pipe 18, a fifth gear 441, a sixth gear 442 and a seventh gear 443 are meshed with the fourth gear 181, and the fifth gear 441, the sixth gear 442 and the seventh gear 443 are respectively and fixedly connected to the three stirring rods 43.

It should be noted that, as shown in fig. 5, the flow channels 432 are connected to a plurality of water outlets distributed in an array.

Preferably, as shown in fig. 3 and 4, four stirring rods 431 are disposed on each stirring rod 43, and the four stirring rods 431 are distributed in a circumferential array with the flow channel 432 as a center.

Preferably, as shown in fig. 3 and 5, three stirring bars 43 are distributed in an equilateral triangle.

Preferably, as shown in fig. 2 and 5, the transmission mechanism includes a drive bevel gear 16 fixedly connected to the other output end of the motor 15, the drive bevel gear 16 is meshed with a driven bevel gear 17 rotatably connected to the pump body 1, the driven bevel gear 17 is coaxially and fixedly connected to a first belt pulley 31, and the first belt pulley 31 is connected to a second belt pulley 33 fixedly connected to the upper end of the rotating sleeve 41 through a belt 32.

Preferably, as shown in fig. 3 to 9, the pushing mechanism includes: the rotary cylinder 5 is rotatably connected to the rotary sleeve 41, an eighth gear 444 meshed with the fourth gear 181 is fixedly connected to the rotary cylinder 5, a track groove is formed in the inner wall of the rotary cylinder 5, the track groove comprises a first groove 51, a first spiral groove 52, a second groove 53 and a second spiral groove 54 which are communicated end to end in sequence, a connecting rod 4611 is slidably connected to the rotary cylinder 5, a protrusion 4612 slidably connected with the track groove is fixedly connected to the connecting rod 4611, and a moving ring 461 is fixedly connected to the lower end of the connecting rod 4611; the connecting ring 45 is rotatably connected to the feeding pipe 18, a sliding rod 4613 is slidably connected to the connecting ring 45, and the sliding rod 4613 is fixedly connected to one end of the moving ring 461; a pushing plate 462 slidably connected to the moving ring 461, a first spring 463 is installed between the pushing plate 462 and the moving ring 461, a positioning mechanism is disposed between the inner end of the pushing plate 462 and the moving ring 461, and a telescopic rod 62 is rotatably connected to one end of the pushing plate 462 located outside the moving ring 461; the telescopic cylinder 61 is rotatably connected to the rotating sleeve 41, the telescopic cylinder 61 is slidably connected to the telescopic rod 62, and a second spring 63 for pushing the telescopic rod 62 to move outwards is installed between the telescopic cylinder 61 and the telescopic rod 62.

It should be noted that, as shown in fig. 5, a sliding groove 611 is provided on the inner wall of the telescopic cylinder 61, and a sliding block 621 slidably connected with the sliding groove 611 is fixedly connected to the top end of the telescopic rod 62.

Preferably, as shown in fig. 5 and 6, the positioning mechanism includes a positioning pin 71 slidably connected to the moving ring 461 and a positioning slot 4621 disposed on the pushing plate 462, one end of the positioning pin 71 is fixedly connected with a positioning block 712, a third spring 72 for pushing the positioning block 712 to be clamped into the positioning slot 4621 is installed between the positioning pin 71 and the moving ring 461, and a control rod 711 penetrating out of the upper surface of the moving ring 461 and used for touching the connecting ring 45 is fixedly connected to the upper end of the positioning pin 71.

Preferably, as shown in fig. 7, a guiding slope is provided on a side of the positioning block 712 facing the positioning groove 4621.

The working principle is as follows;

firstly, the dirty oil sludge to be discharged is placed into the trough 21, the motor 15 is started to drive the first gear 13 and the first screw 11 to rotate, the first gear 13 is driven to rotate to drive the second gear 14 to rotate, and then the second screw 12 is driven to rotate synchronously, so that the screw pump works by utilizing the cooperation of the first screw 11 and the second screw 12, the dirty oil sludge is sucked from the feed pipe 18 and is discharged from the discharge pipe 19, meanwhile, the motor 15 is driven to rotate to drive the drive bevel gear 16 to rotate, and then the driven bevel gear 17 drives the first belt pulley 31 to rotate, and the second belt pulley 33 is driven to rotate under the cooperation of the belt 32, so that the rotating sleeve 41 is driven to rotate, and the third gear 42 is meshed with the inner gear ring 23 due to the fact that the third gear 42 is fixedly connected with the rotating sleeve 41, so that the pump body 1 rotates around the axis of the trough 21, the dirty oil sludge is fully stirred through the feed pipe 18, and the dirty oil sludge is prevented from being sucked due to low mobility.

Simultaneously, the rotation of the rotary sleeve 41 drives the stirring rod 43 to rotate along with the rotation, so that the fifth gear 441, the sixth gear 442 and the seventh gear 443 rotate along with the rotation, and then the three stirring rods 43 are driven to rotate along with the rotation, so that the stirring rod 431 is driven to stir the dirty oil sludge which is about to enter the feeding pipe 18, the caking is broken, the blocking phenomenon is avoided, and meanwhile, a proper amount of water is introduced into the dirty oil sludge through the flow passage 432, so that the water and the dirty oil sludge can be fully mixed, the fluidity of the dirty oil sludge is improved, and the waste of the water can be reduced.

Since the eighth gear 444 and the fourth gear 181 are engaged to drive the rotary drum 5 to rotate when the rotary sleeve 41 rotates, the connecting rod 4611 is slidingly engaged with the rotary drum 5 due to the sliding engagement of the sliding rod 4613 and the connecting ring 45, the telescopic cylinder 61 and the telescopic rod 62 are slidingly engaged with the rotary sleeve 41, the telescopic rod 62 and the pushing plate 462 are hinged, the pushing plate 462 is slidingly engaged with the moving ring 461, so that the pushing plate 462 is driven to follow rotation when the rotary sleeve 41 rotates, since the boss 4612 is slidingly engaged with the track groove in the rotary drum 5, the boss 4612 enters the first spiral groove 52 from the second groove 53 to drive the connecting rod 4611 to rise when the rotary drum 5 rotates, the positioning pin 712 is positioned in the positioning groove 4621 to position the pushing plate 462 and the moving ring 461, the pushing plate 462 is positioned under the feeding pipe 18, the pushing plate 462 moves upward to push the telescopic rod 62 to retract into the telescopic cylinder 61 against the second spring 63, simultaneously, the pushing plate 462 pushes the oil sludge below the feeding pipe 18 into the inlet of the feeding pipe 18, so that the phenomenon of suction is avoided, when the boss 4612 enters the first groove 51, the control rod 711 and the connecting ring 45 touch, the positioning pin 71 is pushed to move downwards against the third spring 72, the positioning block 712 is withdrawn from the positioning groove 4621, and the telescopic rod 62 is pushed to extend under the action of the second spring 63, so that the pushing plate 462 is pushed to move outwards along the axial direction of the moving ring 461, the pushing plate 462 is removed from the position right below the feeding pipe 18, the feeding is avoided, when the boss 4612 enters the second spiral groove 54 from the first groove 51, the connecting rod 4611 is driven to descend, the moving ring 461 is pushed to descend, the telescopic rod 62 slides along the moving ring 461 when the moving ring 461 descends due to the sliding of the sliding block 621, when the boss 4612 returns to the second groove 53, under the action of the inclined plane of the positioning block 712, the positioning block 712 enters the positioning groove 4621 to form positioning, and the pushing plate 462 returns to the position right below the feeding pipe 18 again, namely, circulation is formed, so that the rotation sleeve 41 can be continuously rotated, and the pushing plate 462 can be moved to assist in feeding the sludge, so that suction is avoided.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. The utility model provides a screw pump, includes the pump body, install the motor on the pump body, the both ends of the pump body are provided with inlet pipe and discharging pipe respectively, its characterized in that, the pump body swivelling joint has the screw rod, just the one end of screw rod wear out the pump body and with the output fixed connection of motor, the screw pump still including set up in the sludge stirring pusher on the pump body, the sludge stirring pusher includes:

the hopper is arranged on the outer side of the pump body and is rotationally connected with the discharging pipe, a trough is fixedly communicated with the lower part of the hopper, and an inner gear ring is fixedly connected to an opening at the upper end of the trough;

the stirring mechanism is arranged on the feeding pipe and is used for fully stirring the dirty oil sludge;

the transmission mechanism is arranged between the motor and the stirring mechanism and is used for driving the stirring mechanism to rotate;

the pushing mechanism is arranged on the stirring mechanism and is used for pushing the sewage sludge to the inlet of the feeding pipe.

2. The screw pump according to claim 1, wherein the screw is divided into a first screw and a second screw which are rotatably connected with the pump body, one end of the first screw penetrates out of the pump body and is fixedly connected with a first gear, the first screw is fixedly connected with the output end of the motor, and one end of the second screw penetrates out of the pump body and is fixedly connected with a second gear meshed with the first gear.

3. The screw pump of claim 1, wherein the stirring mechanism comprises:

the rotary sleeve is rotationally connected to the feeding pipe, and the edge of the lower end of the rotary sleeve is fixedly connected with a third gear meshed with the annular gear;

the stirring rods are rotatably connected to the rotating sleeve and provided with three stirring rods, a flow channel is arranged at the central axis of each stirring rod, and a plurality of stirring rods are arranged on the outer side of each stirring rod, which is positioned on the flow channel;

the fourth gear is fixedly connected to the feeding pipe, a fifth gear, a sixth gear and a seventh gear are meshed with the fourth gear, and the fifth gear, the sixth gear and the seventh gear are respectively and fixedly connected to the three stirring rods.

4. A screw pump according to claim 3, wherein four stirring rods are provided on each stirring rod, and the four stirring rods are distributed in a circumferential array centered on the flow passage.

5. A screw pump according to claim 3, wherein three of the stirring bars are arranged in an equilateral triangle.

6. A screw pump according to claim 3, wherein the transmission mechanism comprises a drive bevel gear fixedly connected with the other output end of the motor, the drive bevel gear is meshed with a driven bevel gear rotationally connected with the pump body, the driven bevel gear is coaxially and fixedly connected with a first belt pulley, and the first belt pulley is connected with a second belt pulley fixedly connected with the upper end of the rotating sleeve through a belt.

7. A screw pump according to claim 3, wherein the pushing mechanism comprises:

the rotary drum is rotationally connected to the rotary sleeve, an eighth gear meshed with the fourth gear is fixedly connected to the rotary drum, a track groove is formed in the inner wall of the rotary drum, the track groove comprises a first groove, a first spiral groove, a second groove and a second spiral groove which are sequentially communicated end to end, a connecting rod is slidingly connected in the rotary drum, a protrusion slidingly connected with the track groove is fixedly connected to the connecting rod, and a moving ring is fixedly connected to the lower end of the connecting rod;

the connecting ring is rotationally connected with the feeding pipe, a sliding rod is connected to the connecting ring in a sliding manner, and the sliding rod is fixedly connected with one end of the movable ring;

the pushing plate is connected to the moving ring in a sliding manner, a first spring is arranged between the pushing plate and the moving ring, a positioning mechanism is arranged between the inner end of the pushing plate and the moving ring, and one end, located on the outer side of the moving ring, of the pushing plate is connected with a telescopic rod in a rotating manner;

the telescopic cylinder is rotationally connected to the rotating sleeve, the telescopic cylinder is in sliding connection with the telescopic rod, and a second spring used for pushing the telescopic rod to move outwards is arranged between the telescopic cylinder and the telescopic rod.

8. The screw pump of claim 7, wherein the positioning mechanism comprises a positioning pin slidingly connected to the moving ring and a positioning groove arranged on the pushing plate, one end of the positioning pin is fixedly connected with a positioning block, a third spring for pushing the positioning block to be clamped into the positioning groove is installed between the positioning pin and the moving ring, and the upper end of the positioning pin is fixedly connected with a control rod penetrating out of the upper surface of the moving ring and used for touching the connecting ring.

9. The screw pump of claim 8, wherein a side of the positioning block facing the positioning groove is provided with a guide slope.